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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectMedium2 minQB

PhysicsMediumsingle choice

A certain metal has a work function $ϕ$ . If light of wavelength $λ$ shines on this metal, the photoelectrons have a maximum kinetic energy K. What will be their maximum kinetic energy if light of wavelength $2 λ$ shines on the metal?

Options:

Answer:

Solution:

$K = \frac{h c}{λ} - ϕ K^{'} = \frac{h c}{2 λ} - ϕ = \frac{K - ϕ}{2}$

If this is negative, there is no emission; the answer presumes emission continues

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: QB

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