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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2020

PhysicsEasysingle choice

A plane electromagnetic wave of wave intensity $6 W m^{- 2}$ stikes a small mirror of the area $40 {cm}^{2},$ held perpendicular to the approaching wave. The momentum transferred by the wave to the mirror each second will be

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Answer:

Solution:

In the case of complete reflection, the momentum transfer by the wave to the mirror in each second will be

$P = \frac{2 U}{c} = \frac{2 S_{a v} A}{c} = \frac{2 \times 6 \times 40 \times 10^{- 4}}{3 \times 10^{8}}$

$= 1 .6 \times 10^{- 10} kg m s^{- 1}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2020

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