Question

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

Answer 1

`I=0.0795\ W/m^2`

Step-by-step 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=(P)/(4\pi r^2)\\\\I=(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`