Properties of Sound Waves — Unit test Answers…

1

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An ambulance emits a frequency of 450 Hz from its siren. What frequency is heard by a man as the ambulance moves toward him?

A

less than 450 Hz

B

more than 450 Hz

C

450 Hz

D

0 Hz

2

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Sunlight is shown filtering through clouds.What wave phenomenon is responsible for the sunlight shown in this diagram?

A

diffraction, because light is bent around the clouds

B

refraction, because the light bends through the clouds

C

absorption, because the sunlight is absorbed by the clouds

D

transmission, because the sunlight travels through the clouds

3

During a lab, a student tapes a ruler to a lab table and sets the ruler in motion. A laser detector pointed at the ruler records how many times the ruler vibrates back and forth in a period of time.

A

One; Two; Three; Four

B

One; Two; Four; Three

C

Three; One; Two; Four

D

Four; Two; One; Three

4

If the amplitude of a wave increases by a factor of 4, how is the intensity changed?

A

it increases by a factor of 4

B

it increases by a factor of 16

C

it decreases by a factor of 4

D

it decreases by a factor of 16

5

A flute plays a note with a frequency of 266 Hz. What is the speed of sound if the wavelength is 1.3 m?

A

102 m/s

B

205 m/s

C

346 m/s

D

692 m/s

6

What are examples of devices that use electromagnetic waves? Check all that apply.

A

FM radios

B

microwaves

C

TV remote controls

D

alarm clocks

E

X-rays

7

Ten students stand in a circle and are told to make a transverse wave. What best describes the motion of the students?

A

Each student bumps the shoulder of his or her neighbor.

B

At the exact time, all students take a step to the right.

C

The students skip clockwise, going in a circular motion.

D

One at a time, each student lifts his or her hands up and then down.

8

These graphs show measurements of the density of air as different sound waves pass a single point.Which sound wave will most likely be perceived as the loudest?

A

A graph with time on the x axis and density of air on the y axis. There is a transverse wave that is very short and wide.

B

A graph with time on the x axis and density of air on the y axis. There is a transverse wave that is short and wide.

C

A graph with time on the x axis and density of air on the y axis. There is a transverse wave that is tall.

D

A graph with time on the x axis and density of air on the y axis. There is a transverse wave that is very tall and same width.

9

Which best explains why sound travels fastest through a solid?

A

Sound is a mechanical wave, so closer molecules in the medium cause energy to transfer faster.

B

Sound is a mechanical wave, so if the volume of the medium is greater, more energy is transferred.

C

Sound is an electromagnetic wave, so the medium does not affect the speed.

D

Sound is an electromagnetic wave, so a greater amplitude results in a greater speed.

10

A frequency generator sends a 550 Hz sound wave through both water and ice.

A

2.1 m

B

3.1 m

C

5.2 m

D

8.5 m

11

Consider this image of a wave.

A

A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes up to .8, back down through .75 s and all the way down to 2 before going back up to 2 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.

B

A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to 2, back up through 1 s and all the way up to .7 before going back down to .2 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.

C

A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to .6, back up through 1s and all the way up to .6 before going back down to .4 on the other side of the x axis. It is a repeated pattern with on trough and 3 crests with different amplitude.

D

A graph with time in second on the x axis from 0 to 8 and amplitude on the y axis from 2 to 2. The wave starts at the origin and the trough goes down to 2, back up through 1s and all the way up to .7 before going back down to .2 on the other side of the x axis. Then back up to .3 on the other side of the x axis. The pattern repeats itself but flipped on the x axis

12

The speed of sound through argon is shown.

A

10 m/s

B

250 m/s

C

500 m/s

D

3200 m/s

13

[BLANK]

A

absorption

B

diffraction

C

reflection

D

refraction

14

The diagram represents wavelengths of different colors of visible light that pass by in a specific time period.

A

red

B

yellow

C

blue

D

violet

15

A pebble is dropped in a pond.

A

transverse, because the water molecules move up and down, which is parallel to the motion of the wave

B

transverse, because the water molecules move up and down, which is perpendicular to the motion of the wave

C

longitudinal, because the water molecules move up and down, which is parallel to the motion of the wave

D

longitudinal, because the water molecules move up and down, which is perpendicular to the motion of the wave

16

Which best describes loudness?

A

the subjective measurement of the intensity of sound

B

the subjective measurement of the wavelength of a sound wave

C

an inherent measurement of the intensity of sound

D

an inherent measurement of the wavelength of a sound wave

17

Look at the wave diagram.

A

A graph with time in seconds on the x axis from 0 to 8 and amplitude in meters on the y axis from negative 4 to 4. The wave motion is right away from the origin. The first crest starts at the origin and crosses the x axis at 2 s.

B

A graph with time in seconds on the x axis from 0 to 8 and amplitude in meters on the y axis from negative 4 to 4. The wave motion is right away from the origin. The first crest starts at the origin up to 2 m and crosses the x axis at 2 s.

C

A graph with time in seconds on the x axis from 0 to 8 and amplitude in meters on the y axis from negative 4 to 4. The wave motion is right away from the origin. The first crest starts at the origin up to 3 m and crosses the x axis at 1.7 s.

D

A graph with time in seconds on the x axis from 0 to 8 and amplitude in meters on the y axis from negative 4 to 4. The wave motion is right away from the origin. The first crest starts at the origin up to 3 m and crosses the x axis at 1.7 s.

18

Which are examples of transverse waves? Check all that apply.

A

earthquake P-waves

B

earthquake S-waves

C

radio waves

D

sound

E

visible light

F

X-rays

19

A sound wave travels through water. What best describes the direction of the water particles?

A

The water particles move perpendicular to the source of the sound wave.

B

The water particles move in the same direction as the vibrating source of the sound wave.

C

The water particles move in random patterns because the sound is diffracted in many directions.

D

The water particles do not move because the sound wave does not have enough energy.

20

Sound travels slowest through what temperature of water?

A

20°C

B

40°C

C

60°C

D

80°C

Properties of Sound Waves — Unit test Answers

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