Loudness of sound is proportional to ____________ .

its amplitude

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its frequency

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square of its amplitude

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square of its frequency

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Solution

The correct option is C square of its amplitude
Loudness of sound is proportional to square of its amplitude. Louder the sound, greater is the amplitude.

$L o u d n e s s \propto (a m p l i t u d e)^{2}$

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