Answers26-27 IC Physics 7614BWave Interactions

Sound Waves Answers

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1
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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
2
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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.

Question illustration
A
person A
B
person B
C
person C
D
person D
3

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
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.

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Sound Waves Answers — 26-27 IC Physics 7614B