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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectMedium2 minQB

PhysicsMediumsingle choice

If the surface of a metal is successfully exposed to radiation of $λ_{1} = 350 nm$ and $λ_{2} = 450 nm$ the maximum velocity of photoelectrons will differ by a factor 2. The work function of this metal is

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Solution:

$\frac{h c}{λ _{1}} - ϕ = 4 (\frac{h c}{λ _{2}} - ϕ) ϕ = \frac{h c}{3} (\frac{4}{450 nm} - \frac{1}{350 nm}) ϕ ≃ 3.93 \times 1 0^{- 19} J$

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: QB

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