The amplitude of the electric field in an electromagnetic wave is $1 \ V/m$. The frequency of the wave is $5 \times 10^{14} \ Hz$. The wave propagates along the $z$-axis. What is the average energy density of the electric field in $J/m^3$?
- A$3.1 \times 10^{-12} \ J/m^3$
- B$1.41 \times 10^{-12} \ J/m^3$
- C$2.2 \times 10^{-12} \ J/m^3$
- D$3.4 \times 10^{-12} \ J/m^3$
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