The loudness of sound depends on

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its amplitude

its frequency

its time period

its speed

answer is A.

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Detailed Solution

The loudness of sound depends on its amplitude.
Here, we can say that the amplitude of vibration determines the intensity or loudness of a sound. This is because the intensity of a sound reduces as the distance from the source increases while the amplitude of the vibration increases. Therefore, the loudness is directly proportional to the square of the amplitude.

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