Question

Large surface area produces louder sound . Why?​

Answer 1

Answer:

In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound.

Answer 2

Answer:

The surface area of the vibrating body increases, the loudness of sound increases because the vibrating particles generate a greater amount of energy due to the increased amplitude of vibrations. As the loudness is getting increased, the intensity of sound also increases.