Electromagnetic waves and its nature

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Question

If the intensity of the incident radio wave is $3 w a t t m^{- 2}$ is reflected by the surface, the pressure exerted on the surface is $_____\times 10^{- 8} N / m^{2}$

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Solution

Pressure exerted by reflected wave on the surface is $P = \frac{2 I}{C}$
Intensity of incident radio wave is $I = 3 w a t t m^{- 2}$ and Velocity of light $C = 3 \times 10^{8} m s^{- 1}$
Pressure $P = \frac{2 \times 3}{3 \times 10^{8}} = 2 \times 10^{- 8} N / m^{2}$

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