Suppose the maximum safe intensity of microwaves for human exposure is taken to be 1.00 W/m2 . (a) If a radar unit leaks 10.0 W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away must you be to be exposed to an intensity considered to be safe

We must be approximately at least 1.337 meters away to be exposed to an intensity considered to be safe.

Explanation:

Let suppose that intensity is distributed uniformly in a spherical configuration. By dimensional analysis, we get that intensity is defined by:

(1)

Where:

- Intensity, measured in watts per square meter.

- Radius, measured in meters.

If we know that and , then the radius is:

We must be approximately at least 1.337 meters away to be exposed to an intensity considered to be safe.