SHS 311 Test 1 Questions and Answers With Verified Solutions 2025
What part of the mass-spring model of vibration represents elasticity? - ✔✔Spring
What parameter is missing in the following equation of sinusoidal vibration? d(t)=sin(2ft+θ) -
✔✔Amplitude
What is the physical parameter related to the auditory perception in the last question? - ✔✔Frequency
What is the peak amplitude if the peak-to-peak amplitude of a sine wave is 10 mm? - ✔✔5 mm
How many degrees are there in a quarter of the period of sinusoidal vibration? - ✔✔90
Which is one aspect of auditory perception? - ✔✔Pitch
How does air pressure change when the altitude increases? - ✔✔Decreases
What is the relationship between sound intensity I and pressure p? - ✔✔I is proportional to p^2
A condensation peak - ✔✔Moves away from a vibrating source
If a sound's Frequency (f) is 3500 Hz, and the Speed of Sound (c) is 350 meters/sec, what is the sound's
Wavelength (λ)? - ✔✔0.1 meter
Decibel (dB) is defined as - ✔✔20log (p/pº)
A person requires 5 times more power than normal to detect a sound. How many dab is that?
[log(5)=0.7] - ✔✔7
, What is the power ratio for 3 dB? [0.3=log(2)] - ✔✔2
If one measures sound intensity at 2 m from the sound source, then at 4 m from the sound source,
ideally by what ratio will the sound intensity decrease? - ✔✔Decreases by a ratio of 4
When two points of rarefaction meet with each other, what happens? - ✔✔Reinforcement
What is the frequency of a standing wave related to? - ✔✔Length of string
If the wavelength (λ) of sound 50 cm, what size object is likely to produce a sound shadow? - ✔✔About
50 cm
What are the two graphs used to describe a sound in the frequency domain? - ✔✔Phase spectrum and
Amplitude spectrum
The spectrum of a 200-ms, 2000-Hz tone is narrower than the spectrum of a 20-me, 2000-hz tone -
✔✔Narrower
If a 100 Hz sine wave is added to a 110 Hz sine wave, what is the amplitude modulation frequency of the
combined waveform? - ✔✔10 Hz
A sinusoidal amplitude modulated sinewave has a carrier frequency of 1000 Hz and a modulation
frequency of 50 Hz. Which frequency components are not in its spectrum? - ✔✔1100 Hz
What is indicated by color in the spectrograph of a sound wave? - ✔✔Amplitude
What is a high-pass filter? - ✔✔The amplitude of a sinusoidal components with frequencies below 2000
Hz are attenuated
If the roll-off of a filter is 12 dB/Octave, what would be the filter's attenuation at a frequency two
octaves away from the filter's cutoff frequency? - ✔✔24 dB
What part of the mass-spring model of vibration represents elasticity? - ✔✔Spring
What parameter is missing in the following equation of sinusoidal vibration? d(t)=sin(2ft+θ) -
✔✔Amplitude
What is the physical parameter related to the auditory perception in the last question? - ✔✔Frequency
What is the peak amplitude if the peak-to-peak amplitude of a sine wave is 10 mm? - ✔✔5 mm
How many degrees are there in a quarter of the period of sinusoidal vibration? - ✔✔90
Which is one aspect of auditory perception? - ✔✔Pitch
How does air pressure change when the altitude increases? - ✔✔Decreases
What is the relationship between sound intensity I and pressure p? - ✔✔I is proportional to p^2
A condensation peak - ✔✔Moves away from a vibrating source
If a sound's Frequency (f) is 3500 Hz, and the Speed of Sound (c) is 350 meters/sec, what is the sound's
Wavelength (λ)? - ✔✔0.1 meter
Decibel (dB) is defined as - ✔✔20log (p/pº)
A person requires 5 times more power than normal to detect a sound. How many dab is that?
[log(5)=0.7] - ✔✔7
, What is the power ratio for 3 dB? [0.3=log(2)] - ✔✔2
If one measures sound intensity at 2 m from the sound source, then at 4 m from the sound source,
ideally by what ratio will the sound intensity decrease? - ✔✔Decreases by a ratio of 4
When two points of rarefaction meet with each other, what happens? - ✔✔Reinforcement
What is the frequency of a standing wave related to? - ✔✔Length of string
If the wavelength (λ) of sound 50 cm, what size object is likely to produce a sound shadow? - ✔✔About
50 cm
What are the two graphs used to describe a sound in the frequency domain? - ✔✔Phase spectrum and
Amplitude spectrum
The spectrum of a 200-ms, 2000-Hz tone is narrower than the spectrum of a 20-me, 2000-hz tone -
✔✔Narrower
If a 100 Hz sine wave is added to a 110 Hz sine wave, what is the amplitude modulation frequency of the
combined waveform? - ✔✔10 Hz
A sinusoidal amplitude modulated sinewave has a carrier frequency of 1000 Hz and a modulation
frequency of 50 Hz. Which frequency components are not in its spectrum? - ✔✔1100 Hz
What is indicated by color in the spectrograph of a sound wave? - ✔✔Amplitude
What is a high-pass filter? - ✔✔The amplitude of a sinusoidal components with frequencies below 2000
Hz are attenuated
If the roll-off of a filter is 12 dB/Octave, what would be the filter's attenuation at a frequency two
octaves away from the filter's cutoff frequency? - ✔✔24 dB
