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Q.

A plane electromagnetic wave of wave intensity 6 W/m2 strikes a small mirror area 40 cm2, held perpendicular to the approaching wave. The momentum transferred by the wave to the mirror each second will be

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a

6.4×10−7kg−m/s2

b

4.8×10−8kg−m/s2

c

3.2×10−9kg−m/s2

d

1.6×10−10kg−m/s2

answer is D.

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Detailed Solution

Momentum transferred in one second p=2Uc=2SavAc=2×6×40×10−43×108=1.6×10−10kg-m/s2.
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