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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2020

PhysicsEasysingle choice

What is the force exerted by a photon of intensity $1.4 kW m^{- 2}$ if it falls on a perfect absorber of radius $2 m?$

Options:

Answer:

Solution:

$F_{e x} = \frac{P}{c} = \frac{I A}{c}$

$I = 1.4 \times 1 0^{3} W m^{- 2}$

$A = 4 π r^{2} = 4 \times 3.14 \times {(2)}^{2} m^{2}$

$F_{e x} = 2.35 \times 1 0^{- 4} N$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2020

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