The ratio of average electric energy density and total average energy density of electromagnetic wave is:

Step-by-step solution

Average electric energy density is stated as u E = 1 2 ε 0 E 2 Total average energy density U =   1 2 ε 0 E 2 + 1 2 μ 0 B 2 = 1 2 ε 0 E 2 + 1 2 μ 0 E 2 c 2 (As B = E c ) = 1 2 ε 0 E 2 + 1 2 μ 0 E 2 ε 0 μ 0 = 1 2 ε 0 E 2 + 1 2 E 2 ε 0 = ε 0 E 2 Hence, the ratio, u E U = 1 2 .