COMD 5070 Quizzes - Questions With
Comprehensive Solutions
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 Correct 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
Correct 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
a. its power in watts divided by area
b. period multiplied by velocity
c. force times frequency
d. amplitude divided by acceleration Correct 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 Correct 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 Correct Answer - a.intensity decreases by a
factor equal to the square of the change in distance
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 Correct 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 Correct 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
d. a pure tone, like a sine wave Correct 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 Correct
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 Correct 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
c. mercury in a thermometer
d. cassette tapes Correct Answer - a. all answers are analog
an analog signal ...
a. is not continuous in time
b. consists of snapshots
c. none of these answers are true
Comprehensive Solutions
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 Correct 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
Correct 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
a. its power in watts divided by area
b. period multiplied by velocity
c. force times frequency
d. amplitude divided by acceleration Correct 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 Correct 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 Correct Answer - a.intensity decreases by a
factor equal to the square of the change in distance
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 Correct 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 Correct 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
d. a pure tone, like a sine wave Correct 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 Correct
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 Correct 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
c. mercury in a thermometer
d. cassette tapes Correct Answer - a. all answers are analog
an analog signal ...
a. is not continuous in time
b. consists of snapshots
c. none of these answers are true
