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Question

Which is the quantity determines the loudness of a sound wave ?

A
wavelength
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B
frequency
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C
amplitude.
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D
wave velocity.
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Solution

The correct option is D amplitude.
The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater, and the intensity decreases as the distance from the source increases. Loudness is measured in units called decibels.

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