A beam of white light is incident normally on a plane surface absorbing `70%` of the light and reflecting the rest. If the incident beam carries `30 W

Question

A beam of white light is incident normally on a plane surface absorbing `70%` of the light and reflecting the rest. If the incident beam carries `30 W

A beam of white light is incident normally on a plane surface absorbing `70%` of the light and reflecting the rest. If the incident beam carries `30 W` of power, find the force exerted by it on the surface.

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - `(1.3xx30)/(3xx10^(8))=1.3xx10^(-7)`
change in momentum
`DeltaP=0.7(h)/(lambda)+2xx0.3xx(h)/(lambda)`
`=1.3(P)/(c )=1.3xx(30)/(3xx10^(8))=1.3xx10^(-7)N`.

4 views Answered 2023-02-05 15:29