First slide

Electromagnetic waves and its nature

Question

The radiation force experienced by body exposed to radiation of intensity I, assuming surface of body to be perfectly absorbing is:

Moderate

A

$\frac{π R^{2} I}{c}$
B

$\frac{π R^{2} I}{2 c}$
C

$\frac{I R H}{2 c}$
D

$\frac{I R H}{c}$

Solution

Radiation force=
$\frac{I}{c} \times Area = \frac{I}{c} \cdot \frac{1}{2} \cdot 2 R . H = \frac{I R H}{c}$

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