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

It’s All About Waves

Section 1

This powerpoint presentation requires Windows XP

What do all of these images have in common?

They all contain a wave!!!

water light

microwave

radioSlide 3

So what is a wave????

A wave is any disturbance that transmits energy through matter or space.

So what is a wave????

Click here to answer the next few questions on your worksheet.

How????

Some waves transfer energy by vibration….

Draw the movement of a vibration on your paper.Slide 6

How????How????

Waves that transfer energy by vibration require a medium.

How????How????

The medium can be in one of three forms.

Liquid

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.

Need help? Click enter to show the boxes.

All electromagnetic waves are transverse waves.

Section 2

Click here to answer the questions on your worksheet for Slide 14.

What are sound waves?

Use the chart on the following pages to answer this question.

Does the medium affect the speed of sound?

Altitude = Feet above sea levelMPH = miles per hour, the larger the mph, the faster

the sound travels.

ALTITUDE (ft) ALTITUDE (m) TEMP. (c) MPH KNOTS KM/H

0 (sea level) 0 (sea level) 15 761.6 660 1,223

10,000 3,281 -4.8 734.9 638 1,182

15,000 4,921 -14.7 721.2 627 1,161

20,000 6,562 -24.6 707.3 614 1,138

25,000 8,202 -34.5 693.1 602 1,116

30,000 9,843 -44.4 678.5 590 1,093

35,000 11,483 -54.3 663.7 577 1,069

40,000 13,213 (-60?) 659.7 572.6 1,061

At 20,000 ft above sea level, how fast does sound travel (in mph)?

Chart taken from: http://home.iae.nl/users/wbergmns/jetmach1.htm

Altitude = # of feet/meters above sea levelMPH = miles per hour, the larger the mph, the faster the

sound travels.

10,000 3,281 -4.8 734.9 638 1,182

15,000 4,921 -14.7 721.2 627 1,161

20,000 6,562 -24.6 707.3 614 1,138

25,000 8,202 -34.5 693.1 602 1,116

30,000 9,843 -44.4 678.5 590 1,093

35,000 11,483 -54.3 663.7 577 1,069

40,000 13,213 (-60?) 659.7 572.6 1,061

1. Does sound travel faster at 30,000 ft above sea level or 10,000 ft above sea level?

sound travels.

10,000 3,281 -4.8 734.9 638 1,182

15,000 4,921 -14.7 721.2 627 1,161

20,000 6,562 -24.6 707.3 614 1,138

25,000 8,202 -34.5 693.1 602 1,116

30,000 9,843 -44.4 678.5 590 1,093

35,000 11,483 -54.3 663.7 577 1,069

40,000 13,213 (-60?) 659.7 572.6 1,061

1. This chart is measuring the speed of sound in what type of medium? Solid, Liquid, or Gas

sound travels.

10,000 3,281 -4.8 734.9 638 1,182

15,000 4,921 -14.7 721.2 627 1,161

20,000 6,562 -24.6 707.3 614 1,138

25,000 8,202 -34.5 693.1 602 1,116

30,000 9,843 -44.4 678.5 590 1,093

35,000 11,483 -54.3 663.7 577 1,069

40,000 13,213 (-60?) 659.7 572.6 1,061

1. Does the temperature increase or decrease as the altitude rises?

1. What is the speed of sound in water?

Medium Temperature (°C)

Speed (m/s)

Air 0°C 331 m/s

Air 20°C 343 m/s

Air 60°C 366 m/s

Water 20°C 1,482 m/s

Steel 20°C 5,200 m/s

How Fast Does Sound Travel?

1. Does sound travel faster in a solid medium or a gaseous medium?

Speed (m/s)

Air 0°C 331 m/s

Air 20°C 343 m/s

Air 60°C 366 m/s

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.

Speed (m/s)

Air 0°C 331 m/s

Air 20°C 343 m/s

Air 60°C 366 m/s

Section 3

Sir Isaac Newton

Source: NASA

Newton was interested in the Newton was interested in the properties of light.properties of light.

In 1666, he designed an experiment In 1666, he designed an experiment in which he took two prisms and in which he took two prisms and flashed two rainbows on the wall flashed two rainbows on the wall using sunlight. He then moved the using sunlight. He then moved the prisms until they were on top of prisms until they were on top of each other. The result was white light.each other. The result was white light.

Newton led the way for all other scientists to study light Newton led the way for all other scientists to study light and the electromagnetic spectrum.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 24-26 on your worksheet.

Light Waves

Where do you think the light beam is the brightest?

A or B

Click to the next slide to find out…

Light waves transfer energy.

LIGHT ABSORPTIONWhen you shine a light.

As the light beam travels, some of the energy is absorbed by air particles.

The energy extends out.

But wait! There is another reason!

Air particles can release some of that energy that they had absorbed.

LIGHT SCATTERINGWhen you shine a light.

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.

READY FOR AN OPTICAL ILLUSION?

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

RR FF AA TT OOEE RR CC II NN

What is this called?

In this example, the light wave is moving through two mediums, what are they?

a. Solid and gas c. Gas and solidb. Solid and solid d. Gas and liquid

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.

1. Middle of the cup

2. To the left of the cup of water

3. To the far side of the cup water

LIGHT INTERACTS WITH MATTER 3 DIFFERENT

REFLECTION

ABSORPTION

TRANSMISSION

Transmission is the passing of light through matter.

So….is light transmitted through a window

TRANSMISSION

If light is transmitted through an object it is said to be transparent.

Transparent objects could be air, water, and clear glass.

TRANSMISSIONIf light the is transmitted and scattered it

is said to be translucent.

This shower door is an example of a translucent object.

TRANSMISSIONIf light is not transmitted through the

object, it is said to be opaque.

Light can’t go through the books

Or through this wall

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

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