Here,          Frequency of the plane EM wave, v = 2 × 1010HzAmplitude of electric field,  E0 = 48 Vm-1  Therefore, Wavelength of the wave, λ = cv =3 × 1082 × 1010m = 1.5 × 10-2m Amplitude of oscillating magnetic field,B0 = E0c = 483 × 108T = 1.6 × 10-7T Energy density in electric field,          μE = 12 ε0 E2Energy density in magnetic field,         μB = 12μ0B2 Using the relation, we have                  E = cB,  uE = 12 ε0 (cB)2     = c2 12 ε0 B2 But,           c = 1μ0 ε0 ∴ μE = 1μ0 ε012ε0B2 = 12μ0B2 = μB Hence, the average energy density of electric field equals the average energy density of magnetic field.