Q.

What factor does the loudness of sound depend upon?


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a

Amplitude

b

Frequency

c

Wavelength

d

Speed 

answer is A.

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Detailed Solution

The loudness of sound depends upon amplitude.
The amplitude of the sound wave determines how sound behaves. It is considered that a sound is loud if the amplitude of the sound wave is large. Also, it directly correlates with the square of the vibration's amplitude. In addition, the loudness of the sound will be 4 times if the amplitude of the sound wave doubles.
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