Waves Sources: AGS Physical Science

Slides:



Advertisements
Similar presentations
Characteristics of waves
Advertisements

Waves/Sound. The Nature of Waves What is a wave? –A wave is a repeating ____________ or ____________ that transfers _________ through ________or_________.

WAVES.
Mechanical Waves Types of Wave Describing Waves The Wave Equation.
WAVE UNIT: SECTION 2 NOTES Characteristics of Waves.
Mechanical Waves.
Waves, Electromagnetic Waves, Light, and Sound. Waves is a disturbance moves through a medium from one location to another location A medium is a substance.
By Aimee Chavez. Wave: a disturbance that transfers energy from place to place. The material through which a wave travels through is called a medium.
Waves.
Welcome to 306!   Today is a new marking period – a new start!   DO NOW: Please write three goals you have for yourself in Integrated Science for.
Waves Transferring Energy. Waves: traveling disturbance that carries energy from one place to another Waves travel through water, but they do not carry.
P. Sci. Unit 5 Waves Chapter 17.
Energy in Waves. A Wave is… Any disturbance that transmits energy through matter or space. Energy in Waves.
Chapter 15.2 – Characteristics of Waves amplitude – the maximum distance that the particles of a wave’s medium vibrate from their rest position -in a transverse.
Waves © 2006 Certiport.com. Waves Waves are rhythmic disturbances that carry energy without carrying matter.
Waves Pre-Assessment Characteristics of Waves. 1 and 2. Draw & label a sine curve. Crests Wavelength amplitudeamplitude Trough DisplacementDisplacement.
Waves and Sound.
Waves.
Waves A repeating movement or disturbance that transfers energy...
What is a Wave? Sound and Light are forms of energy that travel in waves A wave is a repeating disturbance or movement that transfers energy through matter.
Sound and Waves.
Chapter 11 Waves.
The Nature and Properties of Waves Section 11.1 & 11.2.
Waves and Sound Chapter 15 Pages What are waves? Waves are rhythmic disturbances that carry energy through matter or space Waves generally travel.
WAVES Wave motion allows a transfer of energy without a transfer of matter.
What are waves? a disturbance that transfers energy from place to place. Classified as either 1. Mechanical- require a medium 2. Electromagnetic- do not.
Waves Basics. Expectations Upon completion of this unit you will be able to: Define waves and wave pulses. Identify the two types of wave pulses. Define.
Wave Properties. AmplitudeWavelengthFrequency Wave Speed.
Energy Transfer - Waves. Waves A wave is any disturbance that transmits energy through matter or empty space. Energy can be carried away from it’s source.
Physical Science 8 th Grade Waves A wave is a rhythmic disturbance that transmits ENERGY through matter or space. Waves carry energy NOT matter. A wave.
Waves and Wave Properties. A wave is a disturbance that carries energy from place to place. A wave does NOT carry matter with it! It just moves the matter.
Waves. A. What are Waves? - Rhythmic disturbances that carry energy through matter and space. B. Medium - Type of material that waves can pass through.
Waves. Definitions Wave: a disturbance that transfers energy through a medium. The matter does not experience net movement, but vibrates about some rest.
Waves & Sound 8 th - Grade. Wave – Repeating disturbance or movement that transfers energy through matter or space. – Ex. Ocean waves, microwave waves,
Characteristics of Waves Chapter 15.2 Notes. Wave Properties There are several wave properties, such as amplitude, wavelength, period, and frequency Amplitude.
Oct 30  Projects due tomorrow!  QOD- How are frequency and wavelength related?  Today: 17.1 – 17.2 notes.
WAVES In Cornell Note Form. WAVES  Waves transmit energy through matter or space by any disturbance of the matter  matter – anything that has volume.
Ms. Pacheco South Oldham HS. A repeating back-and-forth motion about an equilibrium position is a vibration. A disturbance that is transmitted progressively.
Waves G10 Team International School of Guangzhou.
Characteristics of waves.. The Nature of Waves What is a wave? A wave is a repeating disturbance or movement that transfers energy through matter or space.
PROPERTIES OF WAVES. Waves A wave is a means of transferring energy and information from one point to another without there being any transfer of matter.
Waves (I) S3 Physics
Waves Nature.
Waves Turk 1.
Sound.
Unit: Waves and Sound I Can Statements.
Some stuff you should know…
Pearson Prentice Hall Physical Science: Concepts in Action
Sound and Waves.
Sound and Waves.
Ch. 20 Sec. 1 & 2 The Nature of Waves & Properties of Waves
P. Sci. Unit 5 Waves Chapter 17.
Waves Wave properties.
Mechanical vs. Electromagnetic Waves
Waves.
·Are repeating disturbances or vibrations that transfers or moves energy from place to place. Waves:
Wave Properties.
What are waves? A wave is a temporary disturbance that transfers energy from place to place.
Waves Notes.
Types of Wave Describing Waves The Wave Equation
Chapter 16 Section 2.
Sound and Waves.
Cornell Notes Sound Waves
Waves.
Sound.
Sound and Waves.
Bellringer: 5/14/2018 What do you already know about waves?
Sound and Waves.
Waves.
Presentation transcript:

Waves Sources: AGS Physical Science http://www.bbc.co.uk/scotland/education/bitesize/standard/physics/waves/wave_definitions_rev1.shtml

What is a wave? Waves are vibrations moving from one place to another. Waves carry energy from one place to another. Because waves carry energy, they can be used for communication (ex: radio and television waves) and to transmit signals. There are many types of waves (sound, light, etc).

What is a wave? For some types of waves, the medium that carries them has to be matter, either solid, liquid or gas. Water waves obviously have to travel in water! Sound waves need a solid, a liquid or a gas to travel in. The waves in the electromagnetic spectrum (light) do not need any matter to travel in, they are able to travel in a vacuum.

Transverse waves the particles of the medium vibrate at right angles to the direction that the energy travels. This is where the name transverse comes from - it means 'across'. All of the electromagnetic waves are transverse waves, as are water waves. Illustration of transverse waves

Longitudinal waves Sound waves are longitudinal waves the energy travels along in the same direction as the particles vibrate. This type of wave is known as a longitudinal wave, so named because the energy travels along the direction of vibration of the particles. Illustration of longitudinal wave

Frequency, wavelength, amplitude and wave speed

amplitude Symbol is = a is the distance from the center line (or the still position) to the top of a crest or to the bottom of a trough. is measured in meters (m). The greater the amplitude of a wave then the more energy it is carrying.

wavelength symbol is a Greek letter lambda = λ is the distance from any point on one wave to the same point on the next wave along. Wavelength is also measured in meters (m) - it is a length after all.

frequency Symbol is = f is the number of waves passing a point in a certain time. We normally use a time of one second, so this gives frequency the unit hertz (Hz), since one hertz is equal to one wave per second.

A note on Hertz For water waves and sound waves the unit hertz is usually good enough but radio and TV waves have such a high frequency that the kilohertz (kHz) or even the megahertz (MHz) are better units.

Speed (also called velocity) Symbol = v is how far the wave travels in a certain time Wave speed is measured in meters per second (m/s). All the electromagnetic waves travel at 300,000,000 meters per second (3 x 108 m/s). Sound travels at about 340 meters per second.

Wave relationships Wave speed equation When distance is measured in meters (m) and time in seconds (s), the speed is in meters per second (m/s).

Sound Waves

The speed of sound Task – “What does it matter” lab The speed of sound is different for different materials Sound travels fastest through solids and slowest through gases such as air. Task – “What does it matter” lab

Sound Sounds are carried by longitudinal waves the particles of the medium vibrate in the same direction as the energy of the sound is carried. (bottom diagram) Task: review lab Squish in motion

Sound Humans can hear sounds in the range 20 hertz to 20 000 hertz. referred to as the range of hearing. Not everyone can hear over all of this range - the numbers are only approximate. In particular the high frequency limit reduces with age.

Sound The loudness of a sound is a measure of the amplitude of the wave. The greater the amplitude, the louder the sound. The pitch of a sound is a measure of the frequency of the wave. The higher the frequency, the higher the pitch. Task: Straw sounds lab & test tube xylophone

Sound and noise The loudness of a sound is a measure of the amplitude of the wave. The greater the amplitude, the louder the sound. The pitch of a sound is a measure of the frequency of the wave. The higher the frequency, the higher the pitch.

Noise Unwanted background sounds are sometimes called noise. When the sound level of this noise rises to higher levels, we refer to this as noise pollution.

Noise Sound levels are measured on a scale known as the decibel (dB) scale. The higher the number the greater is the sound level. Too much noise can damage hearing. Exposure to 90 decibel sound levels for a long time can cause permanent hearing loss. Exposure to a brief sound level of 140 decibels will cause pain and can cause permanent damage to hearing.

Sources of sounds and their db level Source of sound Sound level in decibels threshold of Sound whispering 20 background noise at home 40 normal talking 60 noise pollution level 90 pneumatic drill - 5 metres away 100 at a club - 1 m from a loudspeaker 120 threshold of pain 140

ultrasounds Ultrasounds are high frequency vibrations beyond the range of human hearing. The frequency of ultrasounds is greater than 20,000 hertz. transmitted by means of longitudinal waves. used in medicine to break up kidney stones and gall stones. It is also used to create images of an unborn baby in a womb.