Question

If the intensity of the incident radio wave of $1w/w^2$ is reflected by the surface, find the pressure exerted on the surface?

• A. $5.67\times {10}^{-9}N/m^2$
• B. $6.67\times {10}^{-9}N/m^2$
• C. $8.67\times {10}^{-9}N/m^2$
• D. $9.67\times {10}^{-8}N/m^2$

Answer 1

The correct option is B $6.67\times {10}^{-9}N/m^2$

For reflecting surface, Pressure

$\begin{array}{c}=\frac{2F}{C}\\ =\frac{2\times 1}{3\times {10}^8}=6.67\times {10}^{-9}N/m^2\\ Ans.\left(B\right)\end{array}$