SHS 311 TEST QUESTIONS AND ANSWERS ALL CORRECT
A cat can detect 1000 times more sound power at 30,000 Hz than a human. How many dB this increase? - Answer- 30 dB
Sally requires 10 times more sound pressure to detect a 1000-Hz tone than Mary. How many dB less sensitive is Sally? - Answer- 20 dB...
SHS 311 TEST QUESTIONS
AND ANSWERS ALL
CORRECT
A cat can detect 1000 times more sound power at 30,000 Hz than a human. How many
dB this increase? - Answer- 30 dB
Sally requires 10 times more sound pressure to detect a 1000-Hz tone than Mary. How
many dB less sensitive is Sally? - Answer- 20 dB
Many animals can detect an intensity that is 4 times more than the minimum sound
intensity. How many dB in this? - Answer- 6.02 dB
When the distance from the source is increased from 2 m to 4m by what factor does the
sound intensity decrease? - Answer- 4
By how many dB does the sound intensity decrease? - Answer- 6.02 dB
I have a 60 dB hearing loss relative to normal hearing. What is the pressure ratio of that
loss compared to normal hearing? - Answer- 1000
I hear 30 dB worse than Mary. How many times more power do I need than Mary to
hear a sound? - Answer- 1000
My loud speakers produce a 40 dB more sound pressure than yours. What is this ratio?
- Answer- 100
If an object vibrates at 2000 Hz, what is the frequency of the sound pressure waveform
generated by the vibrating object? - Answer- 2000 Hz
In the lectures, we have calculated the sound frequency that has a wavelength equal to
the diameter of an adults head and thus can produce a sound shadow for the adult.
Children may have a smaller head with a diameter of 10 cm, what sound frequency may
have a wavelength of 10 cm to generate a sound shadow for children? Assume the
sound speech is 350 m/s. - Answer- 3500 Hz
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