It’s All About Waves Section 1 This powerpoint presentation requires Windows XP Slide 1

What do all of these images have in common? Slide 2

They all contain a wave!!! water light sound microwave radio Slide 3

So what is a wave???? A wave is any disturbance that transmits energy through matter or space. Slide 4

So what is a wave???? Click here to answer the next few questions on your worksheet.here Slide 5

How???? Some waves transfer energy by vibration…. Draw the movement of a vibration on your paper. Slide 6

How???? Waves that transfer energy by vibration require a medium. Slide 7

How???? Slide 8 Solid The medium can be in one of three forms. Liquid Gas

Waves that require a medium are called: Mechanical waves Name two example of waves that require a medium. Click again for a hint. Slide 9

Waves that do not require a medium are called: Electromagnetic waves Name five example of waves that don’t require a medium. Hint-click on the next page. Slide 10

Electromagnetic waves Need help? Click enter to show the boxes. Slide 11

Electromagnetic waves All electromagnetic waves are transverse waves. Slide 12

Section 2 Slide 13

Click here to answer the questions on your worksheet for Slide 14.here What are sound waves? Slide 14

Use the chart on the following pages to answer this question. Does the medium affect the speed of sound? Slide 15

Altitude = Feet above sea level MPH = miles per hour, the larger the mph, the faster the sound travels. ALTITUDE (ft)ALTITUDE (m)TEMP. (c)MPHKNOTSKM/H 0 (sea level) ,223 10,0003, ,182 15,0004, ,161 20,0006, ,138 25,0008, ,116 30,0009, ,093 35,00011, ,069 40,00013,213(-60?) ,061 At 20,000 ft above sea level, how fast does sound travel (in mph)? Slide 16 Chart taken from:

Altitude = # of feet/meters above sea level MPH = miles per hour, the larger the mph, the faster the sound travels. ALTITUDE (ft)ALTITUDE (m)TEMP. (c)MPHKNOTSKM/H 0 (sea level) ,223 10,0003, ,182 15,0004, ,161 20,0006, ,138 25,0008, ,116 30,0009, ,093 35,00011, ,069 40,00013,213(-60?) , Does sound travel faster at 30,000 ft above sea level or 10,000 ft above sea level? Slide 17 Chart taken from:

Altitude = # of feet/meters above sea level MPH = miles per hour, the larger the mph, the faster the sound travels. ALTITUDE (ft)ALTITUDE (m)TEMP. (c)MPHKNOTSKM/H 0 (sea level) ,223 10,0003, ,182 15,0004, ,161 20,0006, ,138 25,0008, ,116 30,0009, ,093 35,00011, ,069 40,00013,213(-60?) , This chart is measuring the speed of sound in what type of medium? Solid, Liquid, or Gas Slide 18 Chart taken from:

Altitude = # of feet/meters above sea level MPH = miles per hour, the larger the mph, the faster the sound travels. ALTITUDE (ft)ALTITUDE (m)TEMP. (c)MPHKNOTSKM/H 0 (sea level) ,223 10,0003, ,182 15,0004, ,161 20,0006, ,138 25,0008, ,116 30,0009, ,093 35,00011, ,069 40,00013,213(-60?) , Does the temperature increase or decrease as the altitude rises? Slide 19 Chart taken from:

1. What is the speed of sound in water? MediumTemperature (°C) Speed (m/s) Air 0°C331 m/s Air 20°C343 m/s Air 60°C366 m/s Water 20°C1,482 m/s Steel 20°C5,200 m/s Slide 20 How Fast Does Sound Travel?

1. Does sound travel faster in a solid medium or a gaseous medium? Slide 21 MediumTemperature (°C) Speed (m/s) Air 0°C331 m/s Air 20°C343 m/s Air 60°C366 m/s Water 20°C1,482 m/s Steel 20°C5,200 m/s How Fast Does Sound Travel?

1. There are three different temperatures listed for air. Given this information, do you think that the speed of sound would be the same or different for hot water and cold water? Explain your answer. How Fast Does Sound Travel? Slide 22 MediumTemperature (°C) Speed (m/s) Air 0°C331 m/s Air 20°C343 m/s Air 60°C366 m/s Water 20°C1,482 m/s Steel 20°C5,200 m/s

Section 3 Slide 23

Sir Isaac Newton Source: NASA Newton was interested in the properties of light. Newton was interested in the properties of light. In 1666, he designed an experiment in which he took two prisms and flashed two rainbows on the wall using sunlight. He then moved the prisms until they were on top of each other. The result was white light. In 1666, he designed an experiment in which he took two prisms and flashed two rainbows on the wall using sunlight. He then moved the prisms until they were on top of each other. The result was white light. Newton led the way for all other scientists to study light and the electromagnetic spectrum. Newton led the way for all other scientists to study light and the electromagnetic spectrum. 3R-46.0 Slide 24

Magnetic Energy Wave Electric Energy Wave Light Wave What is light? Light can be thought of as a wave of electric and magnetic energy. Hence, it is called an electromagnetic wave. The two forms of energy flow perpendicular to each other. Light waves are waves of energy that can vary in size and shape. 3R-42.0 Slide 25

Click here to answer questions on your worksheet.here Slide 26

Light Waves Slide 27

Where do you think the light beam is the brightest? A or B Why? Click to the next slide to find out… Slide 28

Light waves transfer energy. LIGHT ABSORPTION When you shine a light. As the light beam travels, some of the energy is absorbed by air particles. The energy extends out. Slide 29

But wait! There is another reason! Slide 30

Air particles can release some of that energy that they had absorbed. LIGHT SCATTERING When you shine a light. BUT Light waves transfer energy to air particles. When the light is released it scatters. This scattering lets you see light outside the light beam, but it is dim because the light has been scattered. Slide 31

READY FOR AN OPTICAL ILLUSION? Slide 32

If you shine a light into a tank of water, what happens to the light beams when they hit the water? a. The light beam bends b. The light beams stays straight Click for your choices Slide 33

R F A T O E R C I N What is this called? Slide 34

R F A T O E R C I N In this example, the light wave is moving through two mediums, what are they? a.Solid and gasc. Gas and solid b.Solid and solidd. Gas and liquid Slide 35

Why does the light bend? This side of the light wave keeps going at its same speed. This side of the light wave slows down when it hits the glass. When the light moves from one medium to another, such as from air to glass, it slows down. When the light hits the glass at an angle, the waves that hit first slow down first. The waves that don’t hit the glass first are still going at their same, fast speed until they hit the glass. 3R-48.0 Slide 36

Click here and view the broken pencil activity. Draw a picture to describe what you see when you place a pencil in water.here R F A T O E R C I N 1. Middle of the cup 2. To the left of the cup of water 3. To the far side of the cup water Slide 37

LIGHT INTERACTS WITH MATTER 3 DIFFERENT WAYS Slide 38

REFLECTION Slide 39

ABSORPTION Slide 40

TRANSMISSION Transmission is the passing of light through matter. So….is light transmitted through a window Slide 41

TRANSMISSION If light is transmitted through an object it is said to be transparent. Transparent objects could be air, water, and clear glass. Slide 42

TRANSMISSION If light the is transmitted and scattered it is said to be translucent. This shower door is an example of a translucent object. Slide 43

TRANSMISSION If light is not transmitted through the object, it is said to be opaque. Light can’t go through the books Or through this wall Slide 44