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Q.

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 average pressure exerted on the surface is 

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a

zero

b

 E/Atc 

c

E/c

d

2E/Atc

answer is C.

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Detailed Solution

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 Incident momentum, p=Ec For perfectly reflecting surface with normal incidence Change in momentum=Δp=2p=2EcForce=F=ΔpΔt=2EctPressure=P=FA=2EctA

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