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PhysicsModern PhysicsPhotoelectric effectMedium2 minPYQ_2025

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The work function of a metal is 3 eV. The color of the visible light that is required to cause emission of photoelectrons is

Answer:

Solution:

$(KE)_{m a x} = \frac{hc}{λ} - ϕ \frac{hc}{λ} > ϕ [for emission] λ < \frac{hc}{ϕ} \Rightarrow λ < \frac{1242}{3} nm$
So blue light option (B)

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: PYQ_2025

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