Question

A point source emits electromagnetic energy at a rate of 100 W. The intensity 10 m from the source is

Answer 1

Answer:

$I=0.0795\ W/m^2$

Explanation:

Given that,

Power of electromagnetic energy, P = 100 W

We need to find the intensity at a distance of 10 m from the source. Intensity is equal to the power per unit area. So,

$I=\dfrac{P}{4\pi r^2}\\\\I=\dfrac{100}{4\pi (10)^2}\\\\I=0.0795\ W/m^2$

So, the intensity at a distance of 10 m is $0.0795\ W/m^2$