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Light is incident normally on a complete...

Light is incident normally on a completely absorbing surface with an energy flux of `25 Wcm^(-2)` If the surface has an area of `25 cm^(2)` the momentum transferred to the surface in 40 min time duration will be:

A

`3 . 5 xx 10 ^(-6) Ns`

B

` 5 . 0 xx 10 ^(-3) Ns`

C

` 1 . 4 xx 10 ^(-6) Ns`

D

` 6 . 3 xx 10 ^(-4) Ns`

Text Solution

Verified by Experts

The correct Answer is:
B
`Delta P = F Delta t = (PA) Delta t = (I)/(C) A Delta t = 5 xx 10^(-3)` Ns
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