Question

Which of the following statements is correct in relation to electromagnetic waves in an isotropic medium?

(a) Energy due to electric field is equal to that due to magnetic field.
(b) Electric vector E and, magnetic vector B are in phase.
(c) For a given amplitude of E vector, the intensity increases as the first power of frequency f
(d) For cylindrical wave fronts, the amplitude of the wave varies in proportion to 1r2 , where r is the radius of the wave front.

Answer 1

i think that the answer is definetly c