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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6.6×10-11N

1.33×10-11N

1.33×10-10N

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

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