Hi, I was able to correctly calculate the answer to part 1 below but the answer to part 2 is incorrect and I cannot see the error of my ways... any help gratefully received. 1. The problem statement, all variables and given/known data An electromagnetic wave has an intensity of 127 W/m2. 1) Find its rms electric field strength. 2) Find its rms magnetic field strength. 2. Relevant equations Bo = Eo/c Brms = B/sqr(2) 3. The attempt at a solution Answer to part 1 : Eo = 219 V/m Part 2 Calculate Bo = 219/2.998 x 10^8 = 7.3 x 10^-7 Brms = (7.3 x 10^-7)/sqr(2) = 5.17 x 10^-7 T This answer for part 2, doesn't match the expected answer.