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In order to reduce the loudness of a sound, we have to _________________.

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increase its amplitude of vibration of the sound

increase its frequency of vibration of the sound

decrease its amplitude of vibration of the sound

decrease its frequency of vibration of the sound

answer is C.

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Detailed Solution

The distance between the starting point and the maximum displacement of the wave is called amplitude.

As loudness depends upon amplitude, it can be increased by increasing amplitude and it can be decreased by decreasing amplitude.

Thus, in order to reduce the loudness of a sound, we have to decrease the amplitude of vibration of the sound.

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