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A light beam of intensity 20 W//cm^(2) i...

A light beam of intensity `20 W//cm^(2)` is incident normally on a perfectly reflecting surface of sides 25 cm x 15 cm. The momentum imparted to the surface by the light per second is

A

`1.2 xx 10^(-5) kg ms^(-1)`

B

`2 xx 10^(-5) kg ms^(-1)`

C

`1 xx 10^(-5) kg ms^(-1)`

D

`5 xx 10^(-5) kg ms ^(-1)`

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