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PhysicsModern PhysicsPhotoelectric effectEasy2 minQB

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The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0.710 V . When the incident wavelength is changed to a new value, the stopping potential is 1.43 V . The new wavelength is :

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Solution:

$\frac{h c}{λ} = ϕ + e V_{s} \frac{1240}{491} = ϕ + 0.71 \dots\dots .. (1) \frac{1240}{λ} = ϕ + 1.43 \dots\dots\dots .. (2) ∴ λ = 382 nm A n s .$

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: QB

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