Waves Study Slides

5 Point Questions

1st question is for your # 4s

# 1

A “real life” example of a transverse wave is:

a. My cat’s meow

b. Food converting to energy

c. Color

d. A dog whistle being blown

# 1 Answer

A “real life” example of a transverse wave is:

a. My cat’s meowb. Food converting into energyc. Colord. A dog whistle being blown

# 2s…you’re up next

# 2

A “real life” example of a longitudinal wave is:

a. Gamma rays

b. X-rays

c. The Color Purple

d. Sound

# 2 Answer

A “real life” example of a longitudinal wave is:

a. Gamma raysb. X-raysc. The Color Purpled. Sound

# 1s…you’re up next

# 3

Pitch, a measure of a longitudinal wave, has to do with

a. Amplitude

b. Frequency

c. Color

d. Crests and Troughs

# 3 Answer

Pitch, a measure of a longitudinal wave, has to do with

a. Amplitudeb. Frequencyc. Colord. Crests and Troughs

# 3s…you’re up next

# 4

Volume, a measure of a longitudinal wave, has to do with

a. Amplitude

b. Frequency

c. Color

d. Crests and Troughs

# 4 Answer

Volume, a measure of a longitudinal wave, has to do with

a. Amplitudeb. Frequencyc. Colord. Crests and Troughs

# 2s…you’re up next

# 5

True or False: A Longitudinal wave needs a medium in order to travel.

True

False

# 5 Answer

True or False: A Longitudinal wave needs a medium in order to travel.

True –Sound is produced by the vibration of two particles/objects, etc.

False

10 Point Questions

1st question is for your # 4s

# 1

Define Wavelength:

a. The thickness of a compression

b. # of waves per second

c. The distance between two crests or two troughs in a row

d. How large a wave is

# 1 Answer

Define Wavelength: a. The thickness of a compressionb. # of waves per secondc. The distance between two crests or

two troughs in a rowd. How large a wave is

# 3s…you’re up next

# 2

A Definition of Amplitude is: a. The measure from crest to troughb. # of waves per secondc. The distance between two crests

or two troughs in a rowd. The measure of how large a wave

is

# 2 Answer

A Definition of Amplitude is: a. The measure from crest to troughb. # of waves per secondc. The distance between two crests or two

troughs in a rowd. The measure of how large a wave is

# 1s…you’re up next

# 3

How do you measure the amplitude of a transverse wave?

a. The distance from the line of origin to the crest or the line of origin to the trough.

b. The distance from a compression to a rarefaction

c. The # of waves per secondd. The length from one crest to the next

consecutive crest.

# 3 Answer

How do you measure the amplitude of a transverse wave?

a. The distance from the line of origin to the crest or the line of origin to the trough.

b. The distance from a compression to a rarefaction

c. The # of waves per secondd. The length from one crest to the next

consecutive crest.

# 3s…you’re up next

# 4

The two pictures below show a change in

A. Frequency

B. Amplitude

C. Color

D. Wave speed

# 4 AnswerThe two pictures below show a change in

A. FrequencyB. Amplitude—Size of compressionsC. ColorD. Wave speed

# 2s…you’re up next

# 5The following shows a change

in

A. AmplitudeB. Size C. Volume D. Wavelength

# 5 Answer

The following shows a change in

A. AmplitudeB. Size C. Volume D. WavelengthNext question is for your 4s

#6

• The two pictures below show a change in WHAT? Describe.

• 1

• 2

#6 Answer• The two pictures below show a

change in Frequency/Pitch. Picture 1 has a lower frequency, so a lower pitch than Picture 2

• 1

• 2

25 points for the GROUP

Picture of water before a rockPicture of water after a

Is thrown rock is thrown

Explain what happened. Include Amplitude/Frequency, Energy types (if you know them, but I’m not expecting you to), AND wave types!

GROUP Answer

“before” “after”

There is very little energy in the water “before.” A rock, filled with Kinetic Mechanical Energy transfers that energy to the water. The energy flow through the water is still mechanical. Around where the rock hit (the source of energy), the amplitude is high (large waves) and the frequency is high (waves close together). As the energy travels through the water in TRANSVERSE (up and down) waves away from the source, the energy is transferred through all surrounding water and it begins to decrease, thus decreasing in size (amplitude) and frequency (the waves spread out).

20 Point Questions

1st Question is for your 1s

# 1

Draw a picture of a longitudinal wave. Label a compression and a rarefaction. Label a wavelength.

# 1 AnswerDraw a picture of a longitudinal

wave. Label a compression and a rarefaction. Label a wavelength.

Wavelength (Compression to Compression)

Amplitude (Thickness of Compression as the wave moves through the medium)

..Compression Rarefaction

# 2s…you’re up next

# 2

Draw a picture of a transverse wave. Label:

A crest and a trough

A wavelength

The line of origin

Amplitude in one spot

# 2 AnswerDraw a picture of a transverse wave. Label:

A crest and a trough

A wavelength

The line of origin

Amplitude in one spot

# 3s…you’re up next

Wavelength (Crest to Crest)

Line of OriginTrough

CrestAMPLITUDE (LINE OF ORGIN TO CREST)

AMPLITUDE (LINE OF ORGIN TOTROUGH)

# 3Draw a picture of two transverse waves

with a change in Amplitude. Include what an increase in Amplitude would mean for this type of wave in real life.

# 3 Answer Draw a picture of two transverse waves

with a change in Amplitude

SMALLER AMPLITUDE (SMALLER WAVE) LARGER AMPLITUDE (LARGER WAVE)

(DIMMER LIGHT) (BRIGHTER LIGHT)

# 4s…you’re up next

# 4

Explain what happens to Amplitude, Frequency, and wavelength the further you get away from the source. Why?

# 4 AnswerExplain what happens to Amplitude, Frequency, and wavelength the

further you get away from the source. Why?

The source is the source of ENERGY. The further you get away from the source of energy, the less energy there is being transferred. The waves get further apart, so frequency decreases (wavelength increases). Thus, light slows down (wave type/color changes) pitch becomes slightly lower…..both over a VERY large distance. Usually frequency change is not noticeable (Doppler effect does not factor in here). Amplitude, or size, decreases substantially. Therefore….light becomes dimmer, sound quieter.

# 1s…you’re up next

# 5

The following picture shows a change in

What?

Yes, There is more than one answer here.

# 5 AnswerThe following picture

shows a change in

What? There is more than one answer here.

A B

Picture A’s wavelengths are shorter than B. The waves in A are closer together, so the frequency is higher and therefore, so is the pitch. B’s waves are further apart, so frequency is lower (and so is the pitch).

25 Point Questions

FOR THE GROUP

# 1 Velocity (Speed) = Frequency x Wavelength

Calculate the following:

1. A wave is traveling at 37.4 m/s. The Frequency is 15,000 Hz. What is the wavelength? Round to the 1000th.

2. 7 waves pass a fixed point every 12 sec. The waves have a length of 3.4 m. What is the speed of the wave? Round to the nearest 100th.

# 1 Answer1. A wave is traveling at 37.4 m/s. The Frequency is 15,000 Hz. What is the

wavelength?

Speed = Frequency x Wavelength

37.4 = 15,000 x ?

37.4 = .002 m

15,000

2. 7 waves pass a fixed point every 12 sec. The waves have a length of 3.4 m. What is the speed of the wave?

Velocity (Speed) = Frequency x Wavelength ? =(7 waves per 12 sec) x 3.4 m

? = 7 x 3.4

12

1.97 m/s = .58 x 3.4