COMD 5070 Quizzes 2025 Questions
and Answers
As sound travels through air, which of the following changes occur:
a. the molecules change their composition
b. sound can only be transmitted through solid objects, so no changes occur to the
air itself
c. the air molecules travel from the speaker to the listener
d. changes occur in air pressure - --Answer --d. changes occur in air pressure
The frequency of a sound wave
a. is related to the number of vibrations of air molecules that occur each second
b. is directly related to how loud we perceive the sound to be
c. is greater for higher amplitude sounds
d. must be above 10,000 Hz in order to be heard by humans - --Answer --a.
is related to the number of vibrations of air molecules that occur each second
The intensity of a sound can be defined as
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,a. its power in watts divided by area
b. period multiplied by velocity
c. force times frequency
d. amplitude divided by acceleration - --Answer --a. its power in watts
divided by area
The amplitude of a sound wave (i.e. the height of the wave) is related to:
a.the speed of sound
b.the change in air pressure produced by the wave
c. the size of the area that the sound is hitting
d. pressure multiplied by time - --Answer --b.the change in air pressure
produced by the wave
The inverse square law means that
a.intensity decreases by a factor equal to the square of the change in distance
b. the reciprocal of the intensity gives the square of the pressure
c. the sum of squares of the energy equals the inverse of the amplitude
d. decibels are logarithmic as long as you take the square of the reference pressure -
--Answer --a.intensity decreases by a factor equal to the square of the change
in distance
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,Pitch and loudness are:
a. Perceptual correlates of physical properties, their values depend on the what the
listener is experiencing.
c. Physical properties of the waveform
Values that will not change based on the frequency of the sound
d. Values that will not change based on the distance that the listener is standing
from the sound source - --Answer --a. Perceptual correlates of physical
properties, their values depend on the what the listener is experiencing.
There is a 20Hz difference between two sounds. We will probably perceive
differences in the pitch of two sounds more easily if the sounds are:
a. two mid-range frequencies
b. the frequency being low or high makes no difference
c. two higher frequencies
d. two lower frequencies - --Answer --d. two lower frequencies
The human voice is best described as
a. none of the answers describe the human voice
b. completely aperiodic with no repeating components
c. a complex wave containing multiple frequencies
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, d. a pure tone, like a sine wave - --Answer --c. a complex wave containing
multiple frequencies
The fundamental frequency is...
a. the lowest frequency component in the complex sound
b. not related to our perception of pitch
c. usually more than one frequency
d. some notes are longitudinal and some are transverse - --Answer --a. the
lowest frequency component in the complex sound
The loudness of a sound can be related to:
a.primarily the fundamental frequency
b. primarily the sampling rate
c. How many harmonics there are. Pure tones are always the quietest.
d. the amount of change in air pressure produced, but also the frequency of the
sound and its duration - --Answer --d. the amount of change in air pressure
produced, but also the frequency of the sound and its duration
which of the following is an analog signal?
a. all answers are analog
b. voltage through the microphone
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and Answers
As sound travels through air, which of the following changes occur:
a. the molecules change their composition
b. sound can only be transmitted through solid objects, so no changes occur to the
air itself
c. the air molecules travel from the speaker to the listener
d. changes occur in air pressure - --Answer --d. changes occur in air pressure
The frequency of a sound wave
a. is related to the number of vibrations of air molecules that occur each second
b. is directly related to how loud we perceive the sound to be
c. is greater for higher amplitude sounds
d. must be above 10,000 Hz in order to be heard by humans - --Answer --a.
is related to the number of vibrations of air molecules that occur each second
The intensity of a sound can be defined as
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,a. its power in watts divided by area
b. period multiplied by velocity
c. force times frequency
d. amplitude divided by acceleration - --Answer --a. its power in watts
divided by area
The amplitude of a sound wave (i.e. the height of the wave) is related to:
a.the speed of sound
b.the change in air pressure produced by the wave
c. the size of the area that the sound is hitting
d. pressure multiplied by time - --Answer --b.the change in air pressure
produced by the wave
The inverse square law means that
a.intensity decreases by a factor equal to the square of the change in distance
b. the reciprocal of the intensity gives the square of the pressure
c. the sum of squares of the energy equals the inverse of the amplitude
d. decibels are logarithmic as long as you take the square of the reference pressure -
--Answer --a.intensity decreases by a factor equal to the square of the change
in distance
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
,Pitch and loudness are:
a. Perceptual correlates of physical properties, their values depend on the what the
listener is experiencing.
c. Physical properties of the waveform
Values that will not change based on the frequency of the sound
d. Values that will not change based on the distance that the listener is standing
from the sound source - --Answer --a. Perceptual correlates of physical
properties, their values depend on the what the listener is experiencing.
There is a 20Hz difference between two sounds. We will probably perceive
differences in the pitch of two sounds more easily if the sounds are:
a. two mid-range frequencies
b. the frequency being low or high makes no difference
c. two higher frequencies
d. two lower frequencies - --Answer --d. two lower frequencies
The human voice is best described as
a. none of the answers describe the human voice
b. completely aperiodic with no repeating components
c. a complex wave containing multiple frequencies
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
, d. a pure tone, like a sine wave - --Answer --c. a complex wave containing
multiple frequencies
The fundamental frequency is...
a. the lowest frequency component in the complex sound
b. not related to our perception of pitch
c. usually more than one frequency
d. some notes are longitudinal and some are transverse - --Answer --a. the
lowest frequency component in the complex sound
The loudness of a sound can be related to:
a.primarily the fundamental frequency
b. primarily the sampling rate
c. How many harmonics there are. Pure tones are always the quietest.
d. the amount of change in air pressure produced, but also the frequency of the
sound and its duration - --Answer --d. the amount of change in air pressure
produced, but also the frequency of the sound and its duration
which of the following is an analog signal?
a. all answers are analog
b. voltage through the microphone
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