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Q.

A perfectly absorbing surface intercepts a parallel beam of monochromatic light of power 10 W (λ = 500 nm) incident on it normally the force exerted by light beam on the surface is

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a

14×10−7N

b

13×10−7N

c

12×10−7N

d

1×10−7N

answer is B.

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Detailed Solution

Power = 10W
⇒ Force =PC (forperfectlyabsorbingsurface) 
F=103×108m/s=13×10−7 N

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