A plane em wave of wave intensity of 10 W/m2 strikes a small mirror of area 20 cm2, held perpendicular to the approaching wave. The radiation force on the mirror will be
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a
6.6×10-11N
b
1.33×10-11N
c
1.33×10-10N
d
6.6×10-10N
answer is C.
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Detailed Solution
Radiation force = Momentum transferred per second by electromagnetic wave to the mirror=2IavAc=2×10×20×10-43×108=1.33×10-10N