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11.Dual Nature of Radiation and matter
hard
A pulse of light of duration $100 \ ns$ is absorbed completely by a small object initially at rest. Power of the pulse is $30 \ mV$ and the speed of light is $3 \times 10 ^8\ ms ^{-1}$. The final momentum of the object is :
A
$0.3 \times 10^{-17} \ kg ms ^{-1}$
B
$1.0 \times 10^{-17} \ kg ms ^{-1}$
C
$3.0 \times 10^{-17} \ kg ms ^{-1}$
D
$9.0 \times 10^{-17} \ kg ms ^{-1}$
(IIT-2013)
Solution
$\text { Change in momentum }=\frac{\text { power } \times \text { total time }}{\text { speed of light }}=\frac{P \times t}{c} $
$1.0 \times 10^{-17} kg \times m / s$
Standard 12
Physics
