Question

Name the factor that determines Loudness of the sound heard.

Answer 1

Loudness of the sound $L=10{\log }_{10}\frac{I}{I_o}$

where $I$ is the intensity of sound.

Also, intensity of sound depends on the amplitude of sound wave such that $I\propto A^2$

More is the amplitude of wave, more is the intensity of sound wave and thus more is the loudness of sound.

So, loudness of sound depends on amplitude of sound wave.