If the amplitude of a sound is halved, its loudness becomes ..........

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Solution

If the amplitude of a sound is halved, its loudness becomes one-fourth.
Loudness depends on the square of the amplitude of the wave.
That is, $l o u d n e s s \propto {(a m p l i t u d e)}^{2}$
Thus, when amplitude of the wave is halved, the loudness becomes one-fourth.

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Complete the following sentences :

(a) The pitch of sound increases if its frequency ......................................

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