Question

A pulse of light of duration 100 ns is absorbed completely by a small object initially at rest. Power of the pulse is 30and the speed of light is . The final momentum of the object is:

A

B

C

D

Hard
JEE Advanced

Solution

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Correct option is
B

Sol
Watt, 
Incident energy
By debroglie wavelength,
and Energy of photon is
From above two equations,  

Momentum kg ms

So, the answer is option (B).

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