Q. Radiations of intensity $0.5\ W/m^{2}$ are striking a metal plate. The pressure on the plate is
A) $0.166 \times 10^{- 8}N/m^{2}$
B) $0.332 \times 10^{- 8}N/m^{2}$
C) $0.111 \times 10^{- 8}N/m^{2}$
D) $0.083 \times 10^{- 8}N/m^{2}$
Explanation
(b) As metal as reflecting surface, for reflecting surface radiation pressure
$P_{r} = \frac{2S}{c} = \frac{2 \times 0.5}{3 \times 10^{8}} = 0.332 \times 10^{- 8}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.