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**1. Ok, so we have and electromagnetic wave propagating through a vacuum. We know wavelength, and the magnitudes of B in the x and y directions. Also, B=[Bx(i)+By(j)]cos(kz+ωt). That's all the prereq stuff.**

**2. So Intensity is: <P>/A & (1/2)Bmax^2/Zo**

I'm def feeling the second equation is the most useful here! But this equation yields an incorrect answer. Are these the only two equations for Intensity?

I'm def feeling the second equation is the most useful here! But this equation yields an incorrect answer. Are these the only two equations for Intensity?

**3. I've tried taking the magnitude of the B and plugging into the second eq. This didn't work.**

Thanks,

Robert