Question

The greater the surface area of the vibrating body, the________is the loudness of sound.

• A. Lesser
• B. Greater
• C. Remains same
• D. None of these

Answer 1

Answer: (A)

Lesser

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

where $I$ is the intensity of sound.

Greater the surface area of the vibrating body, lesser will be the amplitude of the sound and thus lesser will be the intensity of the sound.

Thus lesser will be the loudness of sound.