I got 0.02 meters (2 * 10^(-2)) for wavelength, then picked A but the correct answer is E. Can someone please fix my error?
hi
i checked the Cambridge website the answer key says D) is the correct answer
i agree wavelength = 0,02, meaning it is microwave
but t = d/v = (9 * 10⁴ * 10³m)/3 * 10⁸ = 0,3