Question

Intensity of a wave is the. (a) Power per unit area (b) Power per unit volume (c) Power per unit time (d) All of the above

Answer 1

Intensity of a wave is Power per unit area.

Step-by-step explanation:

The intensity of wave is defined as the power per unit area in the direction of motion of wave i.e.

`I=(P)/(A)`

Also, the intensity of a wave is directly proportional to the square of its amplitude. Let a is the amplitude of a wave. So,

`I\propto a^2`

The SI unit of power is watt and the SI unit of area is m². So, the SI unit of intensity is W/m². Hence, the correct option is (a) "Intensity of a wave is Power per unit area".