Question

The solar radiation incident on the Earth has a power density of approximately 900W/m2. Find the rms value of the electric field.

I know that Erms = Emax/squareroot(2)

But how can I pass from W/m^2 to electric field?

Answer 1

Update: I have tried to do:

Pd = E^2 / Zo = E^2 /120pi

E^2 = Pd * 120pi

E = squareroot(900 * 120pi) = 582.48 V

Would this be correct?

Answer 2

yes, that is correct.

Answer 3

Thanks.