JEE Advanced 2013 Paper 1 Physics Q6

Physics · Dual Nature of Radiation & Matter

Problem

A pulse of light of duration

100\,\mathrm{ns}

is absorbed completely by a small object initially at rest. Power of the pulse is

30\,\mathrm{mW}

and the speed of light is

3\times10^8\,\mathrm{m\,s^{-1}}

. The final momentum of the object is