REVISION OF P1 Learning Objective: Recap all of the physics content with past paper questions

INDEX REVISION OF P1REVISION OF P1

LEARNING OUTCOMES  Good- know the key facts in the physics module  EBI- You can apply what we recap to past paper questions  Excellent- You can get 75% of marks in each question REVISION OF P1REVISION OF P1

STARTER – GIVE ME 5 1. Kinetic particle theory Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question REVISION OF P1REVISION OF P1

KINETIC PARTICLE THEORY Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY The next few slides will give you all of the information that you need for a question about kinetic particle theory. Make sure you make a note of anything that you’re not sure of

TRANSLATE KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY  You are going to see 3 slides with information about the 3 states of matter.  Translate the information you see into your own words, so that you will be able to remember all of the key facts. Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question

SOLIDS KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY  Particles vibrate in a fixed position  Strong bonds between particles  Particles are close together  Regular pattern in the arrangement  Solids can’t be compressed as the particles have no space to move into and they have a fixed shape as the particles can’t move from place to place Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question

LIQUIDS KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY  Particles vibrate and move around each other  Weaker bonds between particles  Particles are close together in a random arrangement  Liquids can’t be compressed as the particles have no space to move into but they can change their shape to match the container that they are in as the particles can move around each other Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question

GASES KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY  Particles move quickly in any direction  No bonds between particles  Particles are far apart  Random pattern in the arrangement  Gases can be compressed or squashed as they have plenty of space to move into. They also flow and completely fill their container as their particles move quickly in all directions. Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question

PROGRESS CHECK - PARTICLE MODEL KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY  In pairs, design a way that we could use 7 people in order to represent each stage of the kinetic particle theory.  I’ll be choosing THREE pairs at random to demonstrate their model so make sure you ask me if you are struggling with this task Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question

KINETIC THEORY Examiner’s tip Be able to describe the arrangement and movement of particles in solids, liquids and gases Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY

PAST PAPER QUESTION solid gas solid KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY

PAST PAPER QUESTION 1.The marbles model act as molecules / atoms 2.Molecules leaving a liquid = evaporation OR marbles leaving tray = evaporation KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY

PAST PAPER QUESTION 1.To evaporate the alcohol requires energy 2.This energy (heat) is taken from the skin and the skin feels cold KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY

PAST PAPER QUESTION KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY

PAST PAPER QUESTION 1.There are attractive forces between molecules. 2.Only the fastest molecules have enough energy to break away from other molecules. 3.These molecules escape from the surface of the liquid. 4.Therefore the average speed / energy of the remaining molecules goes down. 5.The lower the average speed / energy of molecules the lower the temperature of the liquid. KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY

PROGRESS CHECK Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY

PLENARY – YOU’RE THE EXAMINER Using the examiners tip below, make your own 6 mark question (part of it can be multiple choice) and create your own mark scheme that you’ll use to test someone else in the class “Be able to describe the arrangement and movement of particles in solids, liquids and gases” KINETIC PARTICLE THEORYKINETIC PARTICLE THEORY

LEARNING OUTCOMES  Good- know the key facts in the physics module  EBI- You can apply what we recap to past paper questions  Excellent- You can get 75% of marks in each question REVISION OF P1REVISION OF P1

STARTER THINK, PAIR, SHARE “The three methods of heat transfer are...” Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question TRANSFER OF ENERGYTRANSFER OF ENERGY

QUICK NOTE TRANSFER OF ENERGYTRANSFER OF ENERGY Quickly jot down any information that you do not know from the next 8 slides. If you are happy with the information, try and change it into a maximum of 3 sentences

CONDUCTION – KEY FACTS TRANSFER OF ENERGYTRANSFER OF ENERGY DO NOT COPY ALL OF THIS 1.Metals are good conductors 2.Non-metals and gases are poor conductors 3.Free electrons are able to move about in metals and the part of the metal atoms that are left behind are charged metal ions 4.These metal ions are packed closely together and vibrate all the time 5.The hotter the metal, the faster the vibrations of the ions 6.This kinetic energy is then transferred from the hotter parts of the metal to the cooler parts of the metal by the free electrons as they collide with the ions as they move about

CONVECTION – KEY FACTS TRANSFER OF ENERGYTRANSFER OF ENERGY 1.Liquids and gases are fluids 2.When they are heated, they expand as the particles move faster 3.The liquid or gas then becomes less dense as the particles take up more space but they are still the same size 4.The liquid or gas in hot areas is less dense than the liquid or gas in cold areas, so it rises into the cold areas. 5.The denser cold liquid or gas falls into the warm areas. 6.This cycle continues until the heat source is removed 7.The wind is caused by convection currents from the Earth being heated by the sun DO NOT COPY ALL OF THIS

RADIATION – KEY FACTS TRANSFER OF ENERGYTRANSFER OF ENERGY 1.All objects emit (give out) and absorb (take in) thermal radiation (infrared radiation) 2.The hotter the object, the more infrared radiation given off 3.Infrared radiation is a type of EM radiation so it travels in waves and can travel in a vacuum 4.Dark, matt materials are good absorbers and emitters of infrared radiation 5.Light, shiny materials are poor absorbers and emitters of infrared radiation DO NOT COPY ALL OF THIS

EVAPORATION – KEY FACTS TRANSFER OF ENERGYTRANSFER OF ENERGY 1.The particles in a liquid have different energies 2.Some will have enough energy to escape from the liquid and become a gas. 3.The remaining particles in the liquid have a lower average kinetic energy than before, so the liquid cools down as evaporation happens. 4.This is why sweating cools you down. 5.The sweat absorbs energy from your skin so that it can continue to evaporate. DO NOT COPY ALL OF THIS

CONDENSATION – KEY FACTS TRANSFER OF ENERGYTRANSFER OF ENERGY 1.The particles in a gas have different energies. Some may not have enough energy to remain as separate particles, particularly if the gas is cooled down. 2.They come close together and bonds form between them. 3.Energy is released when this happens. 4.This is why steam touching your skin can cause scalds: not only is the steam hot, but energy is released into your skin as the steam condenses. DO NOT COPY ALL OF THIS

FACTORS AFFECTING CONDENSATION AND EVAPORATION – KEY FACTS TRANSFER OF ENERGYTRANSFER OF ENERGY 1.Condensation happens faster if the temperature of the gas is lowered 2.Evaporation happens faster if the liquid is increased. 3.Evaporation happens faster if the surface area is increased 4.Evaporation happens faster if air is moving over the surface of the liquid DO NOT COPY ALL OF THIS

FACTORS AFFECTING HEAT TRANSFER KEY FACTS TRANSFER OF ENERGYTRANSFER OF ENERGY 1.Bigger temperature difference -> the faster the heat transfer 2.Larger surface area -> the faster the heat transfer 3.Larger volume -> the faster the heat transfer 4.Some materials either increase / decrease heat transfer DO NOT COPY ALL OF THIS

HEAT TRANSFER IN ACTION TRANSFER OF ENERGYTRANSFER OF ENERGY 1.Small animals have a large surface area to volume ratio so the lose heat quickly 2.Large animals have a low surface area to volume ratio so lose heat slowly 3.Arctic fox has small ears to lose heat slowly 4.Fennec fox has large ears to lose heat quickly 5.Car radiators are flat with many fins so they lose heat quickly 6.Household radiators are thin, flat, sometimes with fins, in order to give heat to the room quickly DO NOT COPY ALL OF THIS

PROGRESS CHECK Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question TRANSFER OF ENERGYTRANSFER OF ENERGY

1.Energy needed to produce evaporation comes from the body 2.This stops the body temperature rising TRANSFER OF ENERGYTRANSFER OF ENERGY

PAST PAPER QUESTION 1.The silver space blanket reflects energy back to the runner 2.This reduces the energy transferred from the body by radiation TRANSFER OF ENERGYTRANSFER OF ENERGY

1.transfer of energy by waves / infrared TRANSFER OF ENERGYTRANSFER OF ENERGY 1.Ions gain kinetic energy 2.Energy is transferred to cooler parts of the metal by free electrons

1.Water particles at the bottom are heated 2.Water particles move faster 3.The warmer water expands (becomes less dense) 4.The warm water rises / cold water falls to take its place TRANSFER OF ENERGYTRANSFER OF ENERGY

EXAMINER'S TIPS 1. Know that air is an excellent insulator and examples of insulation materials using trapped air. 2. Be able to explain why evaporation causes the surroundings to cool. 3. Know the factors affecting the rate at which an object transfers energy by heating and applications of this. 4. Know how the nature of a surface affects the amount of infrared emitted. 5. Understand the difference between an object emitting infrared radiation and absorbing infrared radiation. TRANSFER OF ENERGYTRANSFER OF ENERGY

LEARNING OUTCOMES  Good- know the key facts in the physics module  EBI- You can apply what we recap to past paper questions  Excellent- You can get 75% of marks in each question REVISION OF P1REVISION OF P1

STARTER THINK, PAIR, SHARE Why do we need to reduce heat loss in the home? Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question HEAT AND THE HOMEHEAT AND THE HOME

In order to save money, people can change the materials used in housing. E.g. The materials used for their windows Energy-saving solutions cost money to buy and install. The payback time of an energy-saving solution is a measure of how cost-effective it is. Here is the equation to calculate payback time: Payback time (years) = cost of installation (£) ÷ savings per year in fuel costs (£) If the payback time is too long, the energy-saving solution is not cost-effective HEAT AND THE HOME HEAT AND THE HOMEHEAT AND THE HOME

HEAT AND THE HOME HEAT AND THE HOMEHEAT AND THE HOME 1.Specific heat capacity of materials can be found by using the formula: E = m × c × ө 2.This tells us how much energy is needed to increase the temperature of 1kg by one degree Celsius 3.The higher the specific heat capacity, the more energy the material can store (e.g. water) 4.Materials have a U-value which tells us how well heat travels through a material 5.The lower the U-value, the better it is at insulating

HEAT AND THE HOMEHEAT AND THE HOME

1 3 and 4 OR 1 and 2 1.U-values for the 20 mm windows are the same or higher than those for the 16 mm windows 2.So the 20 mm windows are no more energy efficient than 16 mm windows

1 and 2 HEAT AND THE HOMEHEAT AND THE HOME

1.Type B glass transmits less infrared than Type A glass 2.As infrared has a heating effect the conservatory will remain cooler HEAT AND THE HOMEHEAT AND THE HOME

EXAMINER'S TIPS 1. Know that air is an excellent insulator and examples of insulation materials using trapped air. 2. Be able to explain why evaporation causes the surroundings to cool. 3. Know the factors affecting the rate at which an object transfers energy by heating and applications of this. 4. Know how the nature of a surface affects the amount of infrared emitted. 5. Understand the difference between an object emitting infrared radiation and absorbing infrared radiation. HEAT AND THE HOMEHEAT AND THE HOME

PLENARY – YOU’RE THE EXAMINER Using the examiners tips from the previous slide to make your own 6 mark question (part of it can be multiple choice) and create your own mark scheme that you’ll use to test someone else in the class HEAT AND THE HOMEHEAT AND THE HOME

LEARNING OUTCOMES  Good- know the key facts in the physics module  EBI- You can apply what we recap to past paper questions  Excellent- You can get 75% of marks in each question REVISION OF P1REVISION OF P1

ENERGY EFFICIENCY ENERGY EFFICIENCYENERGY EFFICIENCY  Magnetic  Kinetic (movement energy)  Heat (thermal energy)  Light  Gravitational potential  Chemical  Sound  Electrical  Elastic potential  Nuclear Most Kids Hate Learning GCSE Energy Names

ENERGY EFFICIENCY Useful Wasted Input ENERGY EFFICIENCYENERGY EFFICIENCY

Useful Wasted Input ENERGY EFFICIENCYENERGY EFFICIENCY ENERGY EFFICIENCY

ENERGY EFFICIENCYENERGY EFFICIENCY Useful Wasted Input ENERGY EFFICIENCY

ENERGY EFFICIENCYENERGY EFFICIENCY Useful Wasted Input

ENERGY EFFICIENCY ENERGY EFFICIENCYENERGY EFFICIENCY Useful Wasted Input

SANKEY DIAGRAM The thickness of each arrow is drawn to scale to show the amount of energy ENERGY EFFICIENCYENERGY EFFICIENCY

SANKEY DIAGRAM Notice that the total amount of energy before is equal to the total amount of energy after (conservation of energy) ENERGY EFFICIENCYENERGY EFFICIENCY

EFFICIENCY Although the total energy out is the same, not all of it is useful. ENERGY EFFICIENCYENERGY EFFICIENCY

EFFICIENCY Efficiency is defined as Efficiency (%) = useful energy output x 100 total energy input  The closer the efficiency is to 1 or 100%, the more efficient the device is and the less energy it wastes  No device will have an efficiency of 1 or 100% as some energy is always lost as heat to the surroundings ENERGY EFFICIENCYENERGY EFFICIENCY

EXAMPLE Efficiency = 75 x 100 = 15% 500 ENERGY EFFICIENCYENERGY EFFICIENCY

SKETCH A SANKEY DIAGRAM AND CALCULATE THE EFFICIENCY OF EACH DEVICE  A 100J kettle that wastes 10% of it’s energy as sound and 20% energy as heat  A 200J iPod that wastes 10% of it’s energy as heat  A 400J iPod that has 60% useful sound and light energy ENERGY EFFICIENCYENERGY EFFICIENCY

We need to use energy efficient devices as they use less energy to do the same job when compared to less energy efficient devices. Why do you think this is a good thing? Why use energy efficient devices? 1. Save money 2. Less energy resources are used so there will be more for the future 3. Less CO 2 is produced so the effect of global warming will be decreased ENERGY EFFICIENCYENERGY EFFICIENCY

PAST PAPER QUESTION / 200 = or 60% ENERGY EFFICIENCYENERGY EFFICIENCY

PAST PAPER QUESTION 1.More efficient, so less energy / electricity needed 2.Less fuel burned so less CO 2 produced 1.You could turn the sound up or down 2.You could turn the brightness up or down ENERGY EFFICIENCYENERGY EFFICIENCY

1.Most energy out as light or least energy wasted as heat ENERGY EFFICIENCYENERGY EFFICIENCY

squares 14 squares 3 squares 8 squares 1.28 / 50 * = 56%

1.Energy = power × time 2.Power = 0.85 kW, time = Energy = kWh ENERGY EFFICIENCYENERGY EFFICIENCY

PROGRESS CHECK Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question ENERGY EFFICIENCYENERGY EFFICIENCY

ENERGY EFFICIENCY Examiner’s tip Know how to use the equation and calculate the efficiency either as a decimal or as a percentage. Understand why a device or process can never be greater than 100% efficient. Understand the term ‘pay-back’ time in relation to heating and insulating buildings. ENERGY EFFICIENCYENERGY EFFICIENCY

PLENARY – YOU’RE THE EXAMINER Using the examiners tips on the previous page to make your own 6 mark question (part of it can be multiple choice) and create your own mark scheme that you’ll use to test someone else in the class “Be able to describe the arrangement and movement of particles in solids, liquids and gases” ENERGY EFFICIENCYENERGY EFFICIENCY

LEARNING OUTCOMES  Good- know the key facts in the physics module  EBI- You can apply what we recap to past paper questions  Excellent- You can get 75% of marks in each question REVISION OF P1REVISION OF P1

STARTER – GIVE ME 5 1. Generating electricity Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question GENERATING ELECTRICITYGENERATING ELECTRICITY

1.Fossil fuel is burnt 2.The heat turns water to steam 3.The steam turns a turbine 4.The turbine turns a generator 5.This induces a current and creates electricity

GENERATING ELECTRICITYGENERATING ELECTRICITY Electricity from a power station goes to: 1.Step-up transformers – increases the voltage which decreases the current and reduces energy loss 2.High voltage transmission lines 3.Step-down transformers – decrease the voltage to make it safe for us to use 4.Consumers, for example homes, factories and shops.

GENERATING ELECTRICITYGENERATING ELECTRICITY NON-RENEWABLE ENERGY All of these methods are used to heat water to create steam which is used to turn the turbine and generate electricity

GENERATING ELECTRICITYGENERATING ELECTRICITY RENEWABLE ENERGY 1.Wind, hydroelectricity and geothermal all turn a turbine which will create electricity 2.Solar cells use light to create electricity

GENERATING ELECTRICITYGENERATING ELECTRICITY Power stations fuelled by fossil fuels or nuclear fuels are reliable sources of energy. This means they can provide power whenever it is needed. 1.gas-fired station (shortest start-up time) 2.oil-fired station 3.coal-fired station 4.nuclear power station (longest start-up time) Nuclear power stations and coal-fired power stations provide 'base load' electricity - run all the time as they take the longest time to start up. Oil-fired and gas-fired power stations are often used to provide extra electricity at peak times, because they take the least time to start up. The fuel for nuclear power stations is relatively cheap, but the power stations themselves are expensive to build. It is also very expensive to dismantle old nuclear power stations and to store their radioactive waste, which is a dangerous health hazard.

Boiler GENERATING ELECTRICITYGENERATING ELECTRICITY Generator

GENERATING ELECTRICITYGENERATING ELECTRICITY 1.Useful / input 2.6 / 20 = 0.3 or 30% 20 squares 6 squares 14 squares

GENERATING ELECTRICITYGENERATING ELECTRICITY Generator Nuclear fission

PROGRESS CHECK Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question GENERATING ELECTRICITYGENERATING ELECTRICITY

EXAMINER'S TIPS 1. Be able to draw and label a block diagram of a power station showing the main parts. 2. Be able to distinguish the difference between waves and tides. 3. Be able to describe the advantages and disadvantages of solar cells. 4. Understand that to prevent carbon dioxide building up in the atmosphere we can catch it and store it. Some of the best natural containers are old oil and gas fields. 5. Be able to identify and label a diagram of the main parts of the National Grid. GENERATING ELECTRICITYGENERATING ELECTRICITY Wave energy - the rise and fall of the water (kinetic energy) drives generators and makes electricity Tidal energy – when the tide goes in and out, there is a large amount of kinetic energy. This goes through a tidal barrage that contains generators which makes electricity Carbon capture and storage stops carbon dioxide building up in the atmosphere. It involves separating carbon dioxide from waste gases. The carbon dioxide is then stored underground, for example in old oil fields or gas fields.

COST OF ELECTRICITY Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question We can calculate the amount of electrical energy transferred by an appliance and how much it costs to run. This is useful for comparing the advantages and disadvantages of using different electrical appliances COST OF ELECTRICITYCOST OF ELECTRICITY

COST OF ELECTRICITY  E = P × t  E - energy transferred in kWh / J  P - power in kW  T - time in h.  Power is sometimes measured in kWh. To convert from W to kW you must divide by 1,000.  E.g. 2,000 W = 2,000 ÷ 1,000 = 2 kW. COST OF ELECTRICITYCOST OF ELECTRICITY

 Electricity meters measure the number of units of electricity used. The more units used, the greater the cost. total cost = number of units × cost per unit  E.g. if 5 units of electricity are used at a cost of 8p per unit, the total cost will be 5 × 8 = 40p  The number of units used can be calculated using this equation: total cost = power (kW) × time (h) × cost per unit COST OF ELECTRICITYCOST OF ELECTRICITY

PROGRESS CHECK Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question GENERATING ELECTRICITYGENERATING ELECTRICITY

EXAMINER'S TIPS  Know the units of each term in the equation.  Know how to convert power from watts to kilowatts and vice versa.  Know how to convert time from hours to minutes and seconds and vice versa, and be careful to make these conversions in an exam if necessary. COST OF ELECTRICITYCOST OF ELECTRICITY

PLENARY – YOU’RE THE EXAMINER Using the examiners tip below, make your own 6 mark question (part of it can be multiple choice) and create your own mark scheme that you’ll use to test someone else in the class “Be able to calculate the cost of electricity and rearrange the formula and change units when necessary” COST OF ELECTRICITYCOST OF ELECTRICITY

1.acid rain 2.global warming/greenhouse effect COST OF ELECTRICITYCOST OF ELECTRICITY 1.Removal of exhaust gases 2.Use alternative source not producing CO 2

1.E = 5 × 10 8 × 3600 × 24 J/day 2.× 4 (for 4 generators) 3.P × t = 1.73 × (J/day) COST OF ELECTRICITYCOST OF ELECTRICITY

2.66 × × = 4.86 × COST OF ELECTRICITYCOST OF ELECTRICITY 1.useful/input / or 36%

1.boiler – heat to surroundings 2.turbine – not all steam energy 3.used/heat/sound lost to surroundings 4.generator – heat in wires/coils/heat to surroundings 5.transformer – heat in wires/coils/heat to surroundings COST OF ELECTRICITYCOST OF ELECTRICITY 1.Energy spread out/diluted 2.As surroundings become warmer/energy lost as heat

LEARNING OUTCOMES  Good- know the key facts in the physics module  EBI- You can apply what we recap to past paper questions  Excellent- You can get 75% of marks in each question REVISION OF P1REVISION OF P1

STARTER – GIVE ME 5 1. Waves Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each questionWAVES

WAVES WAVES  Waves are vibrations that transfer energy from place to place without matter (solid, liquid or gas) being transferred.  Some waves must travel through a substance. The substance is known as the medium and it can be solid, liquid or gas.

TRANSVERSE WAVES WAVES  In transverse waves, the oscillations (vibrations) are at right angles to the direction of travel and energy transfer  Light and other types of electromagnetic radiation are transverse waves. All types of electromagnetic waves travel at the same speed through a vacuum, such as through space.

LONGITUDINAL WAVES WAVES  In longitudinal waves, the oscillations are along the same direction as the direction of travel and energy transfer.  Sound waves and waves in a stretched spring are longitudinal waves.

LABELLING WAVES WAVES  The wavelength of a wave is the distance between a point on one wave and the same point on the next wave.  The frequency of a wave is the number of waves produced by a source each second. It is also the number of waves that pass a certain point each second.

WAVE EQUATION WAVES  The speed of a wave is related to its frequency and wavelength, according to this equation: v = f × λ  v is the wave speed in metres per second, m/s  f is the frequency in hertz, Hz  λ (lambda) is the wavelength in metres, m.

PAST PAPER QUESTION 1.speed = frequency × wavelength 1.300, 000,000 / = 330m WAVES

WAVES W A 1.0.1m X 2Hz 2.0.2m/s

REFLECTIONWAVES The angle of incidence equals the angle of reflection  Sound waves and light waves reflect from surfaces.  Smooth surfaces produce strong echoes when sound waves hit them, and they can act as mirrors when light waves hit them. The waves are reflected uniformly and light can form images

REFLECTIONWAVES  Rough surfaces scatter sound and light in all directions. However, each tiny bit of the surface still follows the rule that the angle of incidence equals the angle of reflection

REFRACTIONWAVES  Sound waves and light waves change speed when they pass across substances with different densities.  This causes them to change direction and this effect is called refraction.  Refraction doesn't happen if the waves cross the boundary at an angle of 90°(the normal) - they carry straight on.

WAVES  When waves meet a gap in a barrier, they carry on through the gap and spread out  How much they spread out depends on how the width of the gap compares to the wavelength of the waves.  Lots of diffraction happens when the wavelength is the same size as the gap. DIFFRACTION

WAVES  A gap similar to the wavelength causes a lot of spreading with no sharp shadow, e.g. sound through a doorway  A gap much larger than the wavelength causes little spreading and a sharp shadow, e.g. light through a doorway. DIFFRACTION

RAY DIAGRAMSWAVES  Sound waves and light waves change speed when they pass across substances with different densities.  This causes them to change direction and this effect is called refraction.  Refraction doesn't happen if the waves cross the boundary at an angle of 90°(the normal) - they carry straight on.

PAST PAPER QUESTION The normal v light has moved from glass to air / from air to glass WAVES

value of v doubles but the value of y does not double WAVES

As (angle) v increases, angle y increases WAVES no evidence outside this range

SOUNDWAVES  Longitudinal waves  Echoes are reflections of sound waves  Sound can only travel in a solid, liquid or gas  A loud sound has a high amplitude  A quiet sound has a small amplitude  A high pitched sound has a high frequency  A low pitched sound has a low frequency  The normal range of human hearing is between about 20 Hz and 20 kHz  The range becomes less as we get older.  Sounds with frequencies above about 20 kHz are called ultrasound.

PAST PAPER QUESTION Microphone Loud speaker Radio waves WAVES Electrical vibrations Light waves

PAST PAPER QUESTION It will go quieter WAVES

ELECTROMAGNETIC (EM) SPECTRUM WAVES Contains 7 different types of radiation Shortest wavelength Highest frequency Longest wavelength Shortest frequency

RADIOWAVES WAVES  Used for TV and radio  TVs use higher frequencies than radios  Diffraction allows radio signals to be received behind hills and repeater stations are used to improve reception

MICROWAVESWAVES  Used to transmit signals such as mobile phone calls.  Microwave transmitters and receivers on buildings and masts communicate with the mobile telephones in their range.  Some mobile phones may be a health risk.  Others think that the intensity of the microwaves is too low to damage tissues by heating, and microwaves are not ionising.  Some wavelengths can be used to transmit information to and from satellites in orbit. Satellite TV signals use microwaves.

VISIBLE LIGHT AND INFRAREDWAVES VISIBLE LIGHT  Visible light helps us to communicate via sight  Cameras and video recorders use visible light  Very bright light damages our eyes INFRARED  Infrared is used in toasters, heaters and grills and can cause burns  Used in burglar alarms, remote controls and security alarms

Examiner’s tip  Be able to construct a ray diagram to show the image formed by a plane mirror.  Know the order of the electromagnetic waves within the spectrum in terms of energy, frequency and wavelength.  Be able to complete diagrams for wave fronts showing reflection, refraction and diffraction.  Learn the units of the terms in the equation and know how to convert kilohertz to hertz.  Know how radio waves, microwaves, infrared and visible light can be used in communications.  Know the relationship between pitch and frequency. WAVES

PAST PAPER QUESTION to compare mobile phone usage between the two groups enough data to indicate relationship or reduce effect of anomalous data WAVES

PAST PAPER QUESTIONWAVES

1.Research may be biased (in favour of companies) 2.Negative effects on health may not get published 1.It allows people to easily identify lower risk phones 2.And this allows people to make a more informed choice WAVES

PROGRESS CHECK Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each questionWAVES

PLENARY – YOU’RE THE EXAMINER Using the examiners tip on the previous slide to make your own 6 mark question (part of it can be multiple choice) and create your own mark scheme that you’ll use to test someone else in the class WAVES

LEARNING OUTCOMES  Good- know the key facts in the physics module  EBI- You can apply what we recap to past paper questions  Excellent- You can get 75% of marks in each question REVISION OF P1REVISION OF P1

STARTER – GIVE ME 5 1. Origins of the Universe Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE

ORIGINS OF THE UNIVERSE Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question The next few slides will give you all of the information that you need for a question about the origins of the Universe. Make sure you make a note of anything that you’re not sure of ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE

ORIGINS OF THE UNIVERSE Examiner’s tip Be able to explain the term ‘red-shift’ and the ‘Big Bang’ theory. Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE

THE BIG BANG  Theory – an idea but not a fact  The theory states that originally all the matter in the universe was concentrated into a single incredibly tiny point.  This began to enlarge rapidly in a hot explosion (called the Big Bang), and it is still expanding today.  The Big Bang happened about 13.7 billion years ago ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE

EVIDENCE FOR THE BIG BANG  Cosmic microwave background radiation (CMBR) – thought to be left over heat from the original explosion  Doppler effect  Red-shift ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE

EXPLAINING THE DOPPLER EFFECT  When a police car goes past, its siren is high-pitched as it comes towards you, then becomes low-pitched as it goes away.  When a source (e.g. galaxy) moves towards an observer, the observed wavelength decreases and the frequency increases.  When a source (e.g. galaxy) moves away from an observer, the observed wavelength increases and the frequency decreases. ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE

RED-SHIFT  When an object (e.g. galaxy) moves away from an observer, its light is affected by the Doppler effect  We know our sun has helium in it because there are black lines in the spectrum of the light from the Sun where helium has absorbed light. These lines form the absorption spectrum for helium.  When we look at the spectrum of a distant star, we still see an absorption spectrum. However, the pattern of lines has moved towards the red end of the spectrum, as you can see above. ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE

RED-SHIFT  The positions of the lines have changed because of the Doppler effect. Their wavelengths have increased and their frequencies have decreased.  The further from us a star is, the more its light is red-shifted. This tells us that distant galaxies are moving away from us, and that the further away a galaxy is, the faster it's moving away.  Red shift tells us how far away a galaxy is and the speed at which it is getting further away from us ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE

PAST PAPER QUESTION 1.Distance from Earth 2.Speed stars / galaxies are moving (away from Earth) 3.Supports theory that the Universe is expanding / Big Bang theory ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE

PAST PAPER QUESTION 1.The microwave radiation comes from radiation present just after Big Bang 2.The Big Bang theory is currently the only way of explaining CMBR ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE 1.wavelength is decreased and frequency increased

1.Big bang theory – universe started at one point then expanded 2.Steady state theory – universe has no origin / has always existed ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE 1.Wavelength of light increases / frequency of light decreases 2.or wavelength / light moves to red end of spectrum

1.Red-shift is evidence / supports idea of expanding universe 2.Both theories use the idea / accept / explain why the universe is expanding ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE 1.to find evidence to support one or both theories or to find evidence to disprove one or both theories 1.Religious belief or no / insufficient evidence

PROGRESS CHECK Learning Outcomes: Good- know the key facts in the physics module EBI- You can apply what we recap to past paper questions Excellent- You can get 75% of marks in each question ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE

PLENARY – YOU’RE THE EXAMINER Using the examiners tip below, make your own 6 mark question (part of it can be multiple choice) and create your own mark scheme that you’ll use to test someone else in the class “Be able to explain the term ‘red-shift’ and the ‘Big Bang’ theory.” ORIGINS OF THE UNIVERSEORIGINS OF THE UNIVERSE