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'S' is isotropic point source producing ...

`'S'` is isotropic point source producing monochromatic radiation with power `P`. Force on hemisphere is `P/(nC)`. Find the value of '`n'` (C is speed of ligth).

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The correct Answer is:
D
`dF=I/c(ds)`
`F=int dF cos theta rArrF=P/(4piR^(2)xxc)intds costheta rArrP/(4piR^(2)xxc)piR^(2)=P/(4c)rArrn=4`
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