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  • The radiation of intensity I is incident at an angle  with the normal of the surface.If coefficient of r

The radiation of intensity I is incident at an angle \theta with the normal of the surface.If coefficient of reflection is r than the force exerted by the readiation on area A of the surface-

Option: 1

\mathrm{\frac{2 I_A(1+r) \cos ^2 \theta}{C}}


Option: 2

\mathrm{\frac{I A(1+r) \cos ^2 \theta}{c}}


Option: 3

\mathrm{IA \frac{I+r) \cos ^2 \theta}{2 c}}


Option: 4

\mathrm{\frac{I A(1+r) \cos ^2 \theta}{3 c}}


Answers (1)

best_answer

Momentum of incident photons

\mathrm{P=\frac{E}{c}=\frac{I(A \cos \theta) t}{c}}

Now, \mathrm{force, \begin{aligned} f & =\frac{\rho}{s t}=\frac{P(1+\gamma) \cos \theta}{t} \\ & =\left[\frac{I A \cos \theta t}{c}\right] \frac{(1+r) \cos \theta}{t} \\ & =\frac{I A(1+r) \cos ^2 \theta}{c} \end{aligned} }

Posted by

seema garhwal

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