Question

Which is the quantity determines the loudness of a sound wave ?

• A. wavelength
• B. frequency
• C. amplitude.
• D. wave velocity.

Answer 1

Answer: (C)

amplitude.

The intensity or loudness of a sound depends upon the extent to which the sounding body vibrates, i.e., the amplitude of vibration. A sound is louder as the amplitude of vibration is greater, and the intensity decreases as the distance from the source increases. Loudness is measured in units called decibels.