$A$ plane electromagnetic wave is incident on a plane surface of area $A$ normally,and is perfectly reflected. If energy $E$ strikes the surface in time $t$,then the average pressure exerted on the surface is ($c=$ speed of light).
- A$0$
- B$\frac{E}{Atc}$
- C$\frac{2E}{Atc}$
- D$\frac{E}{c}$
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