SHS 311 FINAL Exam Questions and Answers With Verified Solutions 2025
Which is not a physical attribute of sound? - ✔✔Pitch
Pressure depends on what two properties? - ✔✔density of air molecules and acceleration of air
molecules
Which is a gas law? - ✔✔gasses evenly fill the space they occupy
What causes pressure to increase? - ✔✔increase in molecular acceleration, increase in molecular
density, increase in number of air molecules in a set area
If a sewing machine produces a sound pressure of 800 micropascals, how many dB more pressure does
the sewing machine produce relative to the threshold of hearing? - ✔✔40 dB
How would intensity of sound change from 40 to 80 feet? - ✔✔less intense by a factor of 4
If speed of sound increases, and freq of vibration remains the same, the wavelength - ✔✔increases
What is the formula for impedence (Z) - ✔✔Square root of (R2+(Xm-Xs)2)
If length of tube increases, the freq of a standing wave within the tube will - ✔✔decrease
Any change in the amplitude of a sound will result in a change in time domain waveform: true or false -
✔✔true
If the duration of sound decreases, the spectrum of the sound - ✔✔tends to increase in bandwidth
The standing wave generated in the ear canal can also produce what? - ✔✔A resonance
, A filter is? - ✔✔one form of a resonator
Which is a high-pass filter? - ✔✔the amplitudes of sounds with frequencies below 4000 Hz are
attenuated
Filters (which is true)? - ✔✔change both frequency and time domain representations of sound
What remains the same when a sound pressure waveform is generated by a vibrating object? - ✔✔The
frequency of the sound pressure wave is the same as the vibrating frequency
What is a decibel? - ✔✔20log(p/po) = 20 log the ratio of two pressures (p)
what is the relationship between intensity level and distance from source? - ✔✔As distance doubles,
intensity decreases by a factor of 4
What is the frequency of a standing wave proportional to? - ✔✔Length of string
What are two graphs used to describe a sound in the Frequency Domain? - ✔✔Phase spectrum and
amplitude spectrum
when phase difference changes, what else changes? - ✔✔Both the time domain and frequency domain
descriptions will change
What is a high-pass filter? - ✔✔the amplitude of sinusoidal components with freqs below 2000 Hz are
attenuated
Which peak of a sound pressure waveform generates the greatest positive pressure? - ✔✔condensation
What function does the external auditory canal play in helping make the peripheral auditory system
sensitive? - ✔✔It produces standing waves
Which is not a physical attribute of sound? - ✔✔Pitch
Pressure depends on what two properties? - ✔✔density of air molecules and acceleration of air
molecules
Which is a gas law? - ✔✔gasses evenly fill the space they occupy
What causes pressure to increase? - ✔✔increase in molecular acceleration, increase in molecular
density, increase in number of air molecules in a set area
If a sewing machine produces a sound pressure of 800 micropascals, how many dB more pressure does
the sewing machine produce relative to the threshold of hearing? - ✔✔40 dB
How would intensity of sound change from 40 to 80 feet? - ✔✔less intense by a factor of 4
If speed of sound increases, and freq of vibration remains the same, the wavelength - ✔✔increases
What is the formula for impedence (Z) - ✔✔Square root of (R2+(Xm-Xs)2)
If length of tube increases, the freq of a standing wave within the tube will - ✔✔decrease
Any change in the amplitude of a sound will result in a change in time domain waveform: true or false -
✔✔true
If the duration of sound decreases, the spectrum of the sound - ✔✔tends to increase in bandwidth
The standing wave generated in the ear canal can also produce what? - ✔✔A resonance
, A filter is? - ✔✔one form of a resonator
Which is a high-pass filter? - ✔✔the amplitudes of sounds with frequencies below 4000 Hz are
attenuated
Filters (which is true)? - ✔✔change both frequency and time domain representations of sound
What remains the same when a sound pressure waveform is generated by a vibrating object? - ✔✔The
frequency of the sound pressure wave is the same as the vibrating frequency
What is a decibel? - ✔✔20log(p/po) = 20 log the ratio of two pressures (p)
what is the relationship between intensity level and distance from source? - ✔✔As distance doubles,
intensity decreases by a factor of 4
What is the frequency of a standing wave proportional to? - ✔✔Length of string
What are two graphs used to describe a sound in the Frequency Domain? - ✔✔Phase spectrum and
amplitude spectrum
when phase difference changes, what else changes? - ✔✔Both the time domain and frequency domain
descriptions will change
What is a high-pass filter? - ✔✔the amplitude of sinusoidal components with freqs below 2000 Hz are
attenuated
Which peak of a sound pressure waveform generates the greatest positive pressure? - ✔✔condensation
What function does the external auditory canal play in helping make the peripheral auditory system
sensitive? - ✔✔It produces standing waves
