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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectEasy2 minPYQ_2019

PhysicsEasysingle choice

The surface of a metal is illuminated with the light of $400 nm$ . The kinetic energy of the ejected photoelectrons was found to be $1.68$ $eV$ . The work function of the metal is $(hc =$ 1240 eV.nm)

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Answer:

Solution:

Energy of incident light, $E = \frac{12400}{λ ( A ˚ )}$ $E = \frac{1240}{400} = 3.1 eV ∵ E = W_{0} + K_{m a x} \Rightarrow 3.1 = W_{0} + 1.68 \Rightarrow W_{0} = 1.42 eV$

Stream:VITEEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2019

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