slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Chapter: Waves, Sound, and Light PowerPoint Presentation
Download Presentation
Chapter: Waves, Sound, and Light

Loading in 2 Seconds...

play fullscreen
1 / 59

Chapter: Waves, Sound, and Light - PowerPoint PPT Presentation


  • 117 Views
  • Uploaded on

Table of Contents. Chapter: Waves, Sound, and Light. Section 1: Waves. Section 2: Sound Waves. Section 3: Light. Waves. 1. Waves Carry Energy, NOT Matter. A wave is a disturbance or vibration that moves through matter or space. Waves carry energy from one place to another.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Chapter: Waves, Sound, and Light' - lewis-shields


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Table of Contents

Chapter: Waves, Sound, and Light

Section 1: Waves

Section 2: Sound Waves

Section 3: Light

slide2

Waves

1

Waves Carry Energy, NOT Matter

  • A wave is a disturbance or vibration that moves through matter or space.
  • Waves carry energy from one place to another.
  • When waves travel matter is not carried along with the waves.
slide3

Waves

1

Waves Carry Energy, NOT Matter

  • A wave is a disturbance or vibration that moves through matter or space.
  • Waves carry energy from one place to another.
  • When waves travel matter is not carried along with the waves.
slide4

Waves

Transverse Waves

  • Transverse or light waves can travel through matter or space.
slide5

Waves

Transverse Waves

  • A transverse wave causes particles to move back and forth or at right angles (90).
  • High points in the wave are called crests.
  • Low points are called troughs.
slide6

Waves

1

Amplitude of a Transverse Wave

  • The amplitude is half the distance between a crest and trough.
  • As the distance between crests and troughs increases, the amplitude increases.
slide7

Waves

1

Longitudinal Waves

  • Sound waves or longitudinal waves can travel only through matter.
slide8

Waves

1

Sound waves

  • Longitudinal or compressional waves are also known as sound waves.
  • A compressional wave causes particles in matter to move back and forth along the same direction in which the wave travels, like a pulse.
slide9

Waves

1

Sound Waves

  • The places where the coils are squeezed together are called compressions
  • The places where the coils are spread apart are called rarefactions.
  • A series of compressions and rarefactions, at least two of each, forms a compressional wavelength.
slide10

Waves

1

Wavelength

  • The wavelength of a transverse wave is the distance between two crests or two troughs.
slide11

Waves

1

Wavelength

  • The wavelength in a sound (compressional) wave is the distance between two compressions or rarefactions.
slide12

Waves

Amplitude of a

Compressional Wave

  • The amplitude of a compressional wave depends on the density of material in compressions and rarefactions.
slide13

Waves

1

Amplitude and Energy

  • The more energy a wave carries, the larger its amplitude.
  • As wave height increases, volume increases
transverse waves

Transverse Waves*

Frequency- Pitch, high or low (Number of waves)

long wavelength, lower pitch

Measured in Hertz

*

amplitude vs frequency

Amplitude vs Frequency

Amplitude (Volume)

Which Has the higher volume?

Frequency

Which Has the higher pitch?

slide17

Section Check

1

Question 1

Waves carry _______, not _______.

slide18

Section Check

1

Question 1

Waves carry _______, not _______.

Answer

Waves carry energy, not matter. Think of what happens when you shake one end of a rope; a wave travels along the rope, but the rope itself doesn’t move forward.

slide19

Section Check

1

Question 1

What is shown at point A, B, C and D in this illustration?

slide20

Section Check

1

A. crest

B. amplitude

C. direction wave moves

D. trough

slide21

Section Check

1

Question 3

The number of wavelengths that pass by each second is the wave’s _______.

A. diffraction

B. frequency

C. rarefaction

D. wavelength

slide22

Section Check

1

Answer

The answer is B. If you were watching a transverse wave on a rope, the frequency of the wave would be the number of crests or troughs that pass you each second.

slide23

Sound Waves

  • Every sound you hear is caused by something vibrating.

For example, when you talk, tissues in your throat vibrate in different ways to form sounds.

http://www.youtube.com/watch?v=_pcsOG-H3Ac&feature=player_detailpage

2

Making Sound Waves

  • Vibrations transfer energy to air particles, producing sound waves in air.
slide24

Sound Waves MUST travel through matter. it needs the vibration of molecules to MOVE. The more molecules the faster Sound Can Move. Which State of Matter Has the MOST molecules?

slide25

Since Sound Waves MUST travel through matter. Is there Sound in Space? Remember, outer space is a vacuum w/ no matter.

slide26

Sound Waves

The Speed of Sound

  • The speed of sound depends on the matter through which it travels.
  • Sound waves travel faster through solids because the particles are closer together. Then liquids and last gases.

http://www.turtlediary.com/kids-science-experiments/sound-waves-experiment.html

slide27

Sound Waves

Sound Waves are Compressional Waves

  • Since sound waves can only travel through matter, the energy carried by a sound wave is transferred by collisions between particles.

http://www.turtlediary.com/kids-science-experiments/sound-waves-experiment.html

Let’s see this in action!

slide28

Sound Waves

2

The Loudness of Sound

  • What makes a sound loud or soft?
  • The difference is the amount of energy.
  • Loud sounds have more energy than soft sounds.

http://www.youtube.com/watch?v=1a-5tOB5itI

What can we do with this energy? How can we harness it?

http://www.youtube.com/watch?v=DanOeC2EpeA&feature=player_embedded

slide29

Sound Waves

Pitch

  • Pitch is what we think of when we hear a wave’s frequency.
  • Sounds with low frequencies have low pitch
  • Sounds with high frequencies have high pitch.

http://www.youtube.com/watch?v=93DFanOXzL8&feature=player_detailpage

slide30

Sound Waves

Hearing and the Ear

  • The ear is a complex organ that can detect a wide range of sounds.
  • The ear can be divided into three parts—the outer ear, the middle ear, and the inner ear.
slide31

Sound Waves

Hearing and the Ear

  • The three parts—
  • The outer ear
    • Acts like a funnel for sound waves
  • The middle ear
    • Increases the size of the vibrations
    • (Ear Drum)
  • The inner ear
    • Changes the vibrations to nerve signals

http://science.howstuffworks.com/29843-understanding-sound-waves-video.htm

slide32

Sound Waves

2

Hearing and the Ear

http://www.youtube.com/watch?feature=player_detailpage&v=6Ud7gjXSyU0

http://www.childrensuniversity.manchester.ac.uk/interactives/science/brainandsenses/ear/

slide33

Section Check

2

Question 1

Every sound you hear is caused by something that is _______.

A. compressing

B. loud

C. moving

D. vibrating

slide34

Section Check

2

Answer

The answer is D. The sound of your voice is caused by vibrations in your vocal chords.

slide35

Section Check

2

Question 2

Sound waves travel faster through _______ than they do through water.

A. gases

B. liquids

C. plasma

D. solids

slide36

Section Check

2

Answer

The answer is D. This table shows that sound waves travel faster through solids than they travel through water.

slide37

Light Waves

3

http://www.youtube.com/watch?feature=player_detailpage&v=5HqwcySYUgo

slide38

Waves

1

Waves Can Change Direction

  • Waves don’t always travel in a straight line.
  • Waves can change direction when they travel from one material to another.
  • Waves can:
  • reflect (bounce off a surface)
  • refract (change direction)
  • or diffract (bend around an obstacle).
slide39

Light Waves

3

Reflection

  • When a light wave bounces of a surface and the wave is reflected.
slide40

Light Waves

3

Refraction

  • When a light wave moves from air to water, it slows down.
  • This change in speed causes the light wave to bend.
  • Refraction is the change in direction of a wave

http://www.youtube.com/watch?feature=player_detailpage&v=iletCKDCt_0

slide41

Light Waves

3

Diffraction

  • Waves can change direction by diffraction, the bending of waves around an object.
  • The amount diffraction or bending of the wave depends on the size of the obstacle the wave encounters.
  • If the size of the obstacle is much larger than the wavelength, very little diffraction occurs.

http://www.acoustics.salford.ac.uk/feschools/waves/diffract.php

slide42

Light Waves

1

Electromagnetic Waves

  • Light, radio, and X rays are examples of electromagnetic waves.
  • Electromagnetic waves are transverse waves.
  • They contain electric and magnetic parts that vibrate up and down perpendicular to the direction the wave travels.
slide43

Light

3

Waves in Empty Space

  • Electromagnetic wavesare waves that can travel through matter or through empty space.
slide44

Light

3

The Speed of Light

  • When light travels in matter, it interacts with the atoms and molecules in the material and slows down.
  • As a result, light travels fastest in empty space, and travels slowest in solids.
slide45

Light

3

The Electromagnetic Spectrum

  • The electromagnetic spectrum is the complete range of electromagnetic wave frequencies and wavelengths.
slide46

Light

3

The Electromagnetic Spectrum

  • At one end of the spectrum the waves have low frequency, long wavelength, and low energy.
slide47

Light

3

The Electromagnetic Spectrum

  • At the other end of the spectrum the waves have high frequency, short wavelength, and high energy.
slide48

Light

3

The Electromagnetic Spectrum

  • Visible light is the part of the electromagnetic spectrum that can be seen with the eye
slide49

Light

The Electromagnetic Spectrum

3

  • Different colors of light have different wavelengths
slide50

Light

3

The Eye of Seeing Light

  • You see an object when light is emitted or reflected enters your eye.

http://www.youtube.com/watch?v=_5U5sehVanc&feature=player_detailpage

slide51

Light

3

The Eye of Seeing Light

  • The cornea and the lens focus light waves that enter your eye so that a sharp image is formed on the retina.
  • Special cells in the retina cause signals to be sent to the brain when they are struck by light.

http://www.childrensuniversity.manchester.ac.uk/interactives/science/brainandsenses/eye/

slide52

Light

The Eye of Seeing Light

Newton’s Color Wheel

3

http://www.youtube.com/watch?v=37vPrNagz8M&feature=player_detailpage

http://micro.magnet.fsu.edu/primer/java/scienceopticsu/newton/

slide53

Section Check

3

Question 1

Unlike longitudinal waves, electromagnetic waves can travel through _______.

slide54

Section Check

3

Question 1

Unlike longitudinal waves, electromagnetic waves can travel through _______.

Answer

Electromagnetic waves can travel through empty space.

slide55

Section Check

3

Question 2

No material thing, including spaceships, can move faster than _______.

slide56

Section Check

3

Question 2

No material thing, including spaceships, can move faster than _______.

Answer

The answer is the speed of light. Light speed is the upper limit on travel through space.

slide57

Section Check

3

Question 3

Which contains a higher frequency?

A. gamma rays B. infrared waves C. Microwaves D. radio waves

slide58

Section Check

3

Answer

The answer is A. As wavelength decreases, frequency increases.