The unit of quantity on which the loudness of sound depends is

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Metre

Hertz

Metre / second

Second

answer is A.

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Detailed Solution

The unit of quantity on which loudness of sound depends is

metre

.
The loudness and softness of a sound are basically determined by its amplitude. The amplitude of the sound wave depends on the force with which the object vibrates. Tapping the table produces a lower energy (amplitude) sound wave, so you hear a faint sound. On the other hand, if you hit the table hard, it will make a loud noise. Loud sounds are associated with higher energy, so they can travel longer distances.
The amount that the loudness of a sound depends on is the amplitude. Its unit is a