Properties of Sound Waves Answers

1

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A source emits a sound and is represented by the red dot in this map. Four people are located around the source, and the circles represent the sound wave.

A

person A

B

person B

C

person C

D

person D

2

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What two factors affect the speed of a sound wave as it travels through a medium?

A

the energy transferred by the wave and the density of the medium

B

the type of medium and the energy transferred by the wave

C

the type of medium and the temperature of the medium

D

the temperature of the medium and the energy transferred by the wave

3

Which voice can produce a pitch that has a speed of 343 m/s and a wavelength of 0.68 m? Check all that apply.

A

bass

B

baritone

C

tenor

D

contralto

E

soprano

4

What best describes a sound wave?

A

transverse and electromagnetic

B

longitudinal and mechanical

C

longitudinal and electromagnetic

D

transverse and mechanical

5

Juan is standing on the street. An ambulance moves toward him and then passes by.

A

The pitch remains constant as the ambulance moves toward and then away from Juan.

B

The pitch increases and decreases in a repeated pattern as the ambulance passes Juan.

C

The pitch drops to a lower pitch once the ambulance passes by Juan.

D

The pitch increases to a higher pitch once the ambulance passes by Juan.

6

Which best describes the energy of a sound wave as it travels through a medium?

A

It increases.

B

It decreases.

C

It remains the same.

D

It depends on the medium.

7

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.

8

A sound wave travels through air. In which regions are air molecules the least dense?

A

compressions

B

frequencies

C

pitches

D

rarefactions

10

Noah and Nina are 15 m apart in a closed room. Noah says the same sentence twice. The first time, Nina does not hear the sound, but she does hear the sentence the second time.

A

The second sound wave reflects off the walls of the room, so Nina is able to hear the sound.

B

The second sound wave travels faster to Nina, so less energy is dissipated through the air.

C

The air molecules in the compressions of the second wave are more dense, so the sound is louder.

D

The air molecules in the second wave are spaced evenly, so a high-frequency wave is produced.

11

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.

12

Look at the two wave diagrams.

A

Wave A has a greater pitch and frequency.

B

Wave B has a greater pitch and frequency.

C

Wave A has a greater pitch but lower frequency.

D

Wave B has a lower pitch but greater frequency.

13

Which best describes pitch?

A

the amount of time taken for a longitudinal wave to produce one cycle

B

the number of cycles per second perceived by the human ear

C

the amplitude of a wave when the natural frequency is matched

D

the distance between two corresponding parts of a transverse wave

14

Four friends, A, B, C, and D are standing varying distances away from a speaker which is producing sound waves.

A

B

C

D

15

Consider the intensities of the sounds listed below.

A

busy roadway, kids whispering, average home

B

chainsaw, diesel truck, rustling leaves

C

kids whispering, vacuum cleaner, jet airplane

D

library, conversational speech, music from speaker

16

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

17

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.

18

Look at the diagram.

A

B

C

D

Properties of Sound Waves Answers

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