Question

Radiations of intensity 0.5 W $m^{-2}$ are striking a metal plate. The pressure on the plate is

• A. $0.166{10}^{-8}$ N $m^{-2}$
• B. $0.332{10}^{-8}$ N $m^{-2}$
• C. $0.111{10}^{-8}$ N $m^{-2}$
• D. $0.083{10}^{-8}$ N $m^{-2}$

Answer 1

Answer: (A)

$0.166{10}^{-8}$ N $m^{-2}$

Radiation pressure, $P=\frac{I}{c}=\frac{0.5}{3\times {10}^8}=0.166\times {10}^{-8}N{m}^{-2}$