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Perception of Sound

What is ampli...

Question

What is amplitude of vibration? How is amplitude related to loudness?

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Solution

Dear Student,

When a mechanical wave propagates through a medium, the particles of the medium begin to vibrate or oscillate about its mean position. Amplitude is the maximum displacement of a particle from its mean position.

Loudness is directly proportional to the amplitude of the sound vibration. More the amplitude, much louder is the sound.

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Q. To increase loudness of sound by four times, by how much should the amplitude of vibration be changed?

Q. Question 7
The loudness of sound is determined by the

(a) Amplitude of vibration
(b) Ratio of amplitude and frequency of vibration
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Q. The loudness of a sound is 8 dB when the amplitude of vibrations is 3 units. If the amplitude is increased to 12 units, find the loudness of the sound in dB.

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