Energy carried by Electromagnetic Waves

[Gannon]

Homework Statement

An industrial laser is used to burn a hole through a piece of metal. The average density of the light is S = 1.24E9 W/m2. What is the rms value of each of the following fields in the electromagnetic wave emitted by the laser?

Homework Equations

S = ce_oE²
S = (c/u_o)B²
E=cB
S is average density and E,B are rms values.

The Attempt at a Solution

Solving for E:
sqrt(S/ce_o) = E
sqrt(1.24E9/(3e8 x 8.85E-12)) = E = 683405.7 N/C

Solving for B:
E = cB
E/C = B
4.67E11/3E8 = .00228T

I have 5 tries to get this homework right and I'm down to my last one. I want to make sure I'm not leaving anything out this time. Any help is appreciated!

 

[Redbelly98]

Looks good. You might need to watch the significant figures on the answer for E, they checked for that.