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
2E/Atc
d
E/c
answer is C.
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Detailed Solution
Incident momentum, p=Ec For perfectly reflecting surface with normal incidence Change in momentum=Δp=2p=2EcForce=F=ΔpΔt=2EctPressure=P=FA=2EctA