1. The problem statement, all variables and given/known data I need to find the energy transfered per unit time from a microwave oven, and the only information I have is: Wavelength = .122m Peak Magnetic Field of microwaves = 1.3*10^-5 T 2. Relevant equations c=f*lambda I = (c*B^2)/(permeability of free space) = EB / (permeability of free space) 3. The attempt at a solution My problem is I need either "c" or "f" in c=f(lambda) OR the electric field..... I think? I'm not quite sure what to do.