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  • Radiation of intensity I is incident on a perfectly absorbing hemispherical surface of radius R Find force exerted by radiation on the hemisphere. <img alt="" src="https://cdn.entrance3

Radiation of intensity I is incident on a perfectly absorbing hemispherical surface of radius R Find force exerted by radiation on the hemisphere.

Option: 1

\frac{I\left(\pi R^2\right)}{c}


Option: 2

\frac{2 I\left(\pi R^2\right)}{c}


Option: 3

\frac{I\left(2 \pi R^2\right)}{3 c}


Option: 4

\frac{3 I\left(\pi R^2\right)}{c}


Answers (1)

best_answer

Force on perfectly absorbing surface -
\mathrm{ F=\frac{I A}{c}=I x \frac{\text { projected area }}{c}=\frac{I\left(\pi R^2\right)}{c} }

Note:- If surface is perfectly reflecting, then force remains same.

Posted by

shivangi.bhatnagar

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