The loudness of sound depends upon the

by

The loudness of sound depends upon the

velocity of sound waves in the medium.
amplitude of the sound waves.
frequency of the sound waves.
frequency and velocity of the sound waves.
This question was previously asked in
UPSC NDA-2 – 2019
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The correct answer is B) amplitude of the sound waves.
Loudness is the perceptual quality of sound that is most closely associated with intensity. Intensity is proportional to the square of the amplitude of the sound wave. A larger amplitude corresponds to a higher intensity and thus a louder sound.
The frequency of sound waves determines the pitch of the sound. The velocity of sound waves in a medium depends on the properties of the medium (like density and elasticity) and temperature, but it does not directly determine the loudness for a given source and medium. While velocity and frequency are related to wavelength ($\text{velocity} = \text{frequency} \times \text{wavelength}$), loudness is fundamentally related to the energy or power carried by the wave, which is proportional to the square of its amplitude.

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