An industrial laser is used to burn a hole through a piece of metal. The average intensity of the light is S = 1.13 109 W/m2. What is the rms value of each of the following fields in the electromagnetic wave emitted by the laser?

Question

(a) electric field
(b) magnetic field

Answer 1

You can solve for Emax by this

S=(1/munaught*2*speedlight)Em^2

Then solve for Bmax from Em/Bm= speedlight

then the rms value of each is 1/sqrt2 * max value

Answer 2

thanks!