Question

The _______ of a sound wave is defined as the amount of energy passing through a unit area of the wave front in a unit of time.

A. frequency
B. amplitude
C. intensity
D. compression

Answer 1

This is the intensity.

The intensity of a sound wave is the energy in form of vibration that passes through some unit, for example through square meter. The unit for this is watt over square meter or

w/m²

(watt is the energy, square meter is the unit area)