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  • A plate of mass  is in equilibrium in air due to the force exerted by a light be

A plate of mass 10 \mathrm{~g} is in equilibrium in air due to the force exerted by a light beam on the plate. The power of the beam is:

 

Option: 1

10^7 \mathrm{~W}


Option: 2

2 \times 10^7 \mathrm{~W}


Option: 3

3 \times 10^7 \mathrm{~W}


Option: 4

4 \times 10^7 \mathrm{~W}


Answers (1)

best_answer

For equilibrium, the force exerted by the light beam should balance the weight of the plate

F_{\text {photon }}=m g
\begin{aligned} & F_{\text {photon }}=\frac{I A}{c}=\frac{P}{c} \\ & \Rightarrow \frac{P}{c}=m g \Rightarrow p=m g c \\ & P=10 \times 10^{-3} \times 10 \times 3 \times 10^8 \\ & =3 \times 10^7 \mathrm{w} \end{aligned}
 

Posted by

Nehul

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