In an electromagnetic wave,the amplitude of the electric field is $1 \ V/m$. The frequency of the wave is $5 \times 10^{14} \ Hz$. The wave is propagating along the $z$-axis. The average energy density of the electric field,in $J/m^3$,will be:
- A$1.1 \times 10^{-11}$
- B$2.2 \times 10^{-12}$
- C$3.3 \times 10^{-13}$
- D$4.4 \times 10^{-14}$
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