Question

The low-frequency speaker of a stereo set has a surface area of 0.05 m2 and produces 1W of acoustical power. What is the intensity at the speaker

Answer 1

20 W/m^2

Step-by-step explanation

The intensity of a wave at a surface is the average transferred energy per unit area by the wave through the surface:

`I=(P)/(A)`

In this problem, P = 1 W and A = 0.05m^2. Hence, the intensity at the speaker is:

`I=(1W)/(0.05m^2)=(1W)/((1)/(20)m^2)=20W/m^2`