Question

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

• A. $\frac{\pi R^{2} I}{c}$
• B. $\frac{\pi R^{2} I}{2 c}$
• C. $\frac{I R H}{2 c}$
• D. $\frac{I R H}{c}$

Answer 1

Answer: (D)

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