Question

A radio wave transmits 22.9 W/m2 of power per unit area. A flat surface of area A is perpendicular to the direction of propagation of the wave. Assuming the surface is a perfect absorber, calculate the radiation pressure on it.

Answer 1

\[P _{absorb}=\frac{E _{f}}{c}\]
where Ef is the energy flux in W/m^2 and c is the speed of light in a vacuum.

\[P _{absorb}=\frac{22.9}{3\times10^{8}}=(you\ can\ calculate)\ Pa\]