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Light with an energy flux of 9 W cm^(-2)...

Light with an energy flux of 9` W cm^(-2)` ? falls on a nonreflecting surface at normal incidence. If the surface has an area of `20 cm^(2)`. The total momentum delivered for complete absorption in one hour is

A

`2.16xx10^(-4)kg ms^(-1)`

B

`1.16xx10^(-3)kg ms^(-1)`

C

`2.16xx 10^(-3)kg ms^(-1)`

D

`3.16xx10^(-4)kg ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
(c)
Given, ` I=9 W cm^(-2), A=20cm^(2),` time, `t=60xx60 ` seconds
`I=(Q)/(At)`
`Q=9xx20xx3600`
Total monentum,
`P=(Q)/(C)=(9xx20xx3600)/(3xx10^(8))=2.16xx10^(-3)kgms^(-1)`.
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Knowledge Check

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