Light of wavelength λ falls on a metal having work function λ 0 hc . Photoelectric effect will take place onlyif:

ϕ = λ 0 h c Emission needs λ h c ≥ λ 0 h c Thus λ ≤ λ 0 including the threshold limit

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PhysicsModern PhysicsPhotoelectric effectMedium2 minQB

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Light of wavelength $λ$ falls on a metal having work function $\frac{hc}{λ _{0}}$ . Photoelectric effect will take place onlyif:

Answer:

Solution:

$ϕ = \frac{h c}{λ _{0}}$

Emission needs

$\frac{h c}{λ} \geq \frac{h c}{λ _{0}}$

Thus

$λ \leq λ_{0}$

including the threshold limit

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: QB

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