JEE Advanced | 2013Photoelectric EffectHard

Question

A pulse of light of duration 100 ns is absorbed completely by a small object initially at rest. Power of the pulse is 30 mW and the speed of light is 3 × 108 ms-1. The final momentum of the object is :-

Options

A.0.3 × 10-17 kg ms-1 
B.1.0 × 10-17 kg ms-1 
C.3.0 × 10-17 kg ms-1 
D.9.0 × 10-17 kg ms-1 

Solution


Energy incident = P (time)
              = 30 mW (100 ns)
              = 3 × 10-9
So momentum 10-17 kg m/sec.

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