Question

The intensity of a plane electromagnetic wave is $ 5\,W/m^2. $ It is incident on a perfectly reflecting surface. Find the radiation pressure.

• A. $ 3.33\times 10^{-9}N/m^{2} $
• B. $ 3.33\times 10^{-8}N/m^{2} $
• C. $ 8.0\times 10^{-8}N/m^{2} $
• D. $ 8.0\times 10^{-9}N/m^{2} $

Answer 1

Answer: (B)

The radiation pressure
$ p = \frac{2S}{c} $
$ =\frac{2\times 5}{3\times 10^{8}} $
$ =3.33\times 10^{-8} N/m^{2} $