If the intensity of an electromagnetic wave is $0.02 \ W/m^2$ and its velocity in free space is $3 \times 10^8 \ m/s$,then the energy density of the radiation is ..... $J/m^3$.
- A$6.67 \times 10^{11}$
- B$6.67 \times 10^{-11}$
- C$1.5 \times 10^{10}$
- D$1.5 \times 10^{-10}$
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