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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:

Text Solution

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Pressure `P=I/C`
`impliesF/A=I/CimpliesF=(IA)/C=(DeltaP)/(Deltat)`
`impliesDeltap=I/CADeltat`
`=((25xx250xx10^(4)xx10^(-4)xx40xx60)/(3xx10^(8)))N-s`
`=5xx10^(-3)N-s`
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