In a plane EM wave, the electric field oscillates sinusoidally at a frequency of $$5 \times 10^{10}$$ Hz and an amplitude of $$50 \text{ V m}^{-1}$$. The total average energy density of the electromagnetic field of the wave is : [Use $$\varepsilon_0 = 8.85 \times 10^{-12} \text{ C}^2 \text{N}^{-1}\text{m}^{-2}$$]

A

$$1.106 \times 10^{-8} \text{ J m}^{-3}$$

B

$$4.425 \times 10^{-8} \text{ J m}^{-3}$$

C

$$2.212 \times 10^{-8} \text{ J m}^{-3}$$

D

$$2.212 \times 10^{-10} \text{ J m}^{-3}$$