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Sound Waves Answers

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The diagrams show the sound waves produced in one second from various tuning forks.Which sound wave has the lowest pitch?

A
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out farther apart, get closer together and then farther apart again.
Option A
B
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out farther apart, get closer together and then farther apart again. The line pattern then repeats.
Option B
C
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out close together, get farther apart and then close together again. The line pattern then repeats.
Option C
D
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out close together, get farther apart and then close together again. The line pattern then repeats. The farther apart section gets wider the further the lines are from the fork.
Option D
2
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What best describes a sound wave?

A
transverse and electromagnetic
B
longitudinal and mechanical
C
longitudinal and electromagnetic
D
transverse and mechanical
3

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
4

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.
5

An illustration of a ringing bell and dots representing air molecules. The dots are close together, then far apart and close together again representing a longitudinal mechanical wave of sound going from the bell to an ear.

Question illustration
A
three
B
four
C
six
D
ten
6

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

A
compressions
B
frequencies
C
pitches
D
rarefactions
7

Which diagram best shows the perceived sound wave heard by a woman after a police car has passed her?

A
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength close together in the front and farther apart in the back.
Option A
B
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength longer closer to the siren and closer together the farther from the siren on both sides.
Option B
C
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren that are concentric and evenly spaced.
Option C
D
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength changing in all directions.
Option D
8

A guitar string is plucked. What best describes the formation and transmission of the sound wave?

A
The string vibrates the surrounding air, which produces a transverse wave.
B
The string vibrates the surrounding air, which produces a longitudinal wave.
C
The string produces a longitudinal wave that travels without a medium.
D
The string produces a transverse wave that travels without a medium.
9

The figure shows a sound wave as a function of time when the source is stationary with respect to the observer.

Question illustration
A
An illustration of a transverse wave and three crests and three troughs are labeled 1 s total.
Option A
B
An Illustration of a transverse wave that is taller than the previous. Three crests and three troughs are labeled 1 s total.
Option B
C
An Illustration of a transverse wave and four crests and four troughs are labeled 1 s total.
Option C
D
An Illustration of a transverse wave and seven crests and seven troughs are labeled 1 s total.
Option D
10

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.
11

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.

Question illustration
A
person A
B
person B
C
person C
D
person D
12

is the perceived frequency of a sound wave.

Answer not available
13

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
14

A student hears a police siren. What would change the frequency that the student hears? Check all that apply.

A
if the student walked toward the police car
B
if the student walked away from the police car
C
if the police car moved toward the student
D
if the police car moved away from the student
E
if the intensity of the siren increased
F
if the intensity of the siren decreased
15

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
16

Which diagram best shows the perceived sound wave heard by a woman after a police car has passed her?

A
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength close together in the front and farther apart in the back.
Option A
B
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength longer closer to the siren and closer together the farther from the siren on both sides.
Option B
C
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren that are concentric and evenly spaced.
Option C
D
An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength changing in all directions.
Option D
17

The diagrams show the sound waves produced in one second from various tuning forks.Which sound wave has the lowest pitch?

A
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out farther apart, get closer together and then farther apart again.
Option A
B
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out farther apart, get closer together and then farther apart again. The line pattern then repeats.
Option B
C
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out close together, get farther apart and then close together again. The line pattern then repeats.
Option C
D
An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out close together, get farther apart and then close together again. The line pattern then repeats. The farther apart section gets wider the further the lines are from the fork.
Option D
18

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.
19

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

A
diffraction
B
Doppler effect
C
reflection
D
resonance

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