Loudness and Amplitude
Physics ⇒ Waves and Sound
Loudness and Amplitude starts at 7 and continues till grade 12.
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See sample questions for grade 12
A sound has an intensity level of 70 dB. If another sound is 10 times more intense, what is its intensity level in dB?
A sound has an intensity of 1 × 10-6 W/m2. Calculate its intensity level in decibels (dB) given that the threshold of hearing is 1 × 10-12 W/m2.
A sound wave has an amplitude of 0.02 m. If the amplitude is reduced to 0.01 m, what happens to the loudness?
A sound wave has an amplitude of 0.05 m and produces a certain loudness. If the amplitude is tripled, by what factor does the loudness change?
A sound wave has an intensity of 5 × 10-7 W/m2. What is its intensity level in dB? (I0 = 1 × 10-12 W/m2)
A speaker emits a sound with a power output of 2 W. If you are standing 4 m away from the speaker, what is the intensity of the sound at your location? (Assume sound spreads uniformly in all directions.)
Describe how the human ear perceives loudness and how it differs from the physical measurement of amplitude.
Describe the difference between sound intensity and loudness.
Explain why a sound of 80 dB is not perceived as twice as loud as a sound of 40 dB.
Explain why two sounds of the same amplitude but different frequencies may not be perceived as equally loud.
If a sound source moves closer to a listener, what happens to the perceived loudness?
If the amplitude of a sound wave is doubled, by what factor does its intensity increase?
If the distance from a sound source is doubled, what happens to the intensity of the sound?
If the intensity of a sound increases from 10-8 W/m2 to 10-6 W/m2, by how many decibels does the intensity level increase?
The threshold of hearing is defined as the minimum sound intensity that can be heard by the average human ear. What is its value in W/m2?
