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Light with an energy flux 20 W//cm^2 fal...

Light with an energy flux` 20 W//cm^2` falls on a non-reflecting surface at normal incidence. If the surface has an area of `30 cm^2`. the total momentum delivered ( for complete absorption)during 30 minutes is

A

`36 xx 10^5 kg-m//s`

B

`36xx10^4 kg-m//s`

C

`1.08 xx 10^4 kg -m//s`

D

`1.08xx10^7 kg-m//s`

Text Solution

Verified by Experts

The correct Answer is:
B
In case of perfectly non reflecting surface,
`Deltap=E/c`
where
`e = 20xx30xx30xx60`
`= 1.08xx10^6 j`
`Deltap=(1.08xx10^6)/(3xx10^8)`
`36xx10^-4 kg-m//s`.
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