First slide

Momentum and Radiation pressure

Question

Light with energy flux 36 W/cm² is incident on a well polished metal square plate of side 2 cm. The force experienced by it is

Moderate

Solution

Energy flux = 36 x 10⁴ Wm^-2
$\begin{array}{rcl} F & = & \frac{2 IA}{C} \\ = & \frac{2 x 36 x 10^{4} x 4 x 10^{- 4}}{3 x 10^{8}} \\ = & \frac{288}{3} x 10^{- 8} \\ = & 96 x 10^{- 8} \\ = & 0.96 x 10^{- 6} N \\ = & 0.96 μN \end{array}$

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