For alkali metals, threshold frequencies lie | vedclass

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Question

(A) The threshold frequency $( 
u_0)$ is the minimum frequency of incident radiation required to eject photoelectrons from a metal surface.Alkali met

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Visible region

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(A) The threshold frequency $( 
u_0)$ is the minimum frequency of incident radiation required to eject photoelectrons from a metal surface.Alkali metals (such as Lithium, Sodium, Potassium, etc.) have very low work functions $( \Phi_0 = h 
u_0)$.Because their work functions are low, the energy required to eject electrons is small, which corresponds to a lower threshold frequency.This threshold frequency for alkali metals typically falls within the visible region of the electromagnetic spectrum.Therefore, visible light is sufficient to cause the photoelectric effect in alkali metals.

For alkali metals, threshold frequencies lie in which region?

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