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  • A plane electromagnetic wave of intensity  strikes a small mirror of ar

A plane electromagnetic wave of intensity 10 \mathrm{Wm}^{-2} strikes a small mirror of area 20 \mathrm{~cm}^2 , held perpendicular to the approaching wave. The radiation force on the mirror will be

Option: 1

6.6 \times 10^{-11} \mathrm{~N}


Option: 2

1.33 \times 10^{-11} \mathrm{~N}


Option: 3

1.33 \times 10^{-10} \mathrm{~N}


Option: 4

6.6 \times 10^{-10} \mathrm{~N}


Answers (1)

best_answer

Radiation force=momentum transferred per sec by electromagnetic wave to the mirror
\mathrm{\begin{aligned} & =\frac{2 S_{\mathrm{av}} A}{c}=\frac{2 \times(10) \times\left(20 \times 10^{-4}\right)}{\left(3 \times 10^8\right)} \\ & =1.33 \times 10^{-10} \mathrm{~N} \end{aligned}}

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shivangi.bhatnagar

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