Question

Radiations of intensity `0.5 W//m^(2)` are striking a metal plate. The pressure on the plate is
A. `0.166xx10^(-8)N//m^(2)`
B. `0.33xx10^(-8)N//m^(2)`
C. `0.111xx10^(-8)N//m^(2)`
D. `0.083xx10^(-8)N//m^(2)`

Answer 1

Correct Answer - a
Intensity or power per unit area of the radiation `P=fv rArr f=(P)/(v)=(0.5)/(3xx10^(8))=0.166xx10^(8)N//m^(2)`