A pulse of light of duration `100 ns` is absorbed completely by a small object initially at rest. Power of the pulse is `30 m W` and the speed of light is `3xx10 ms^(-1)`. The final momentum of the object is :

Options

A. `0.3xx10^(17) kg ms^(-1)`
B. `1.0xx10^(17) kg ms^(-1)`
C. `3.0xx10^(-17) kg ms^(-1)`
D. `9.0xx10^(-17)kg ms^(-1)`

Answer

B

Explanation

`"Change in momentum"=("power"xx"total time")/("speed of light")=(Pxxt)/(c )`
`1.0xx10^(-17) kgxxm//s`