Hearing Science CMSD3030 Final Review Questions
with Correct Answers
Acoustics is the branch of physics that deals with the study of Correct
Answer-sound
Assume that a pendulum is at rest in the neutral position. Once it starts
vibrating, ______ moves it from its maximum displacement in either
direction back to its resting position. Correct Answer-Elasticity
A pendulum is set into motion. It is observed that the amount of
displacement gradually decreases over time, and eventually the
pendulum comes to a standstill. What is this phenomenon called?
Correct Answer-Damping
The movement of an object from one point in space and back to the
same point is called Correct Answer-vibration
Once a vibrating object is set into motion, which of the following is
necessary to sustain vibration? Correct Answer-inertia and elasticity
What is represented on the horizontal axis of a waveform? Correct
Answer-time
Which of the following describes the word 'periodic'? Correct Answer-
predictable, regular pattern, perfectly repeatable over time
,Which of the following measures of amplitude represents the amplitude
of a wave at one given instant in time? Correct Answer-instantaneous
amplitude
What is the time period of a sound with a frequency of 100 Hz? Correct
Answer-0.01 seconds
A certain sound completes 50 cycles in 2 seconds. What is the frequent
of this sound? Correct Answer-25 Hz
Which of the following is the correct relationship between wavelength,
frequency, and speed of sound? Correct Answer-wavelength= speed of
sound/frequency
The speed of sound in air at normal temperatures and amplitude at sea
level is Correct Answer-340 meters/second
A the frequency of a sound changes, which of the following must also
change? Correct Answer-time period and wavelength
The movement of a point moving along the circumference of a unit
circle can be translated into a sine wave. Which of the following points
on the circle would correspond to an instantaneous phase of 180 degrees
on the sine wave? Correct Answer-half circle
An area with a relatively high concentration of air particles next to a
vibrating source is called a Correct Answer-condensation
,Which of the following is the best description of wavelength? Correct
Answer-the distance between one condensation and the very next
condensation
Which of the following is the best description of longitudinal
transmission? Correct Answer-individual particles in the medium move
in the same plane as the overall wave
The amount of force applied on a certain area is a measure of Correct
Answer-pressure
Which of the following is the most complete definition of sound
intensity in terms of power? Correct Answer-energy transmitted per unit
time per unit area
Which of the following is the minimum amount of sound power that a
normal hearing human being can detect? Correct Answer-10^-12 w/m^2
Which of the following is true? Correct Answer-I bel= 10 decibels
Solve log(16/10) Correct Answer-0.2
The wavelength of sounds A and B are 30 m and 300 m, respectively.
Which of the following statements must be true, assuming that sound is
, traveling within the same medium for both sounds? Correct Answer-A
has a higher frequency than B
When sound intensity is expressed in terms of dB intensity level, what is
the reference value used? Correct Answer-10-12w/m^2
What is the intensity in dB IL of a sound with an absolute power of 10-
2w/m^2? Correct Answer-100
Which of the following statements is true? Correct Answer-dB SPL=
20log(P1/20uPa)
What is the intensity in terms of dB SPL of a sound with an absolute
pressure of 2*106uPa? Correct Answer-100
What is the absolute power corresponding at 40 dB IL? Correct Answer-
10-8w/m^2
An environment without any reflections at all is called Correct Answer-
free field
What happens to sound power when the distance from the source to the
receiver increases by a factor of three? Correct Answer-it decreases by a
factor of nine
Which of the following statements is true? Correct Answer-P infinity /I
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