Threshold frequency of which of the following | vedclass

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(D) The threshold frequency $
u_0$ is related to the work function $\Phi$ by the equation $\Phi = h
u_0$,where $h$ is Planck's constant.Metals like

Vedclass · Accepted Answer

Sodium

Vedclass · Answer

(D) The threshold frequency $
u_0$ is related to the work function $\Phi$ by the equation $\Phi = h
u_0$,where $h$ is Planck's constant.Metals like Zinc,Magnesium,and Cadmium have high work functions,meaning their threshold frequencies lie in the ultraviolet $(UV)$ region of the electromagnetic spectrum.Sodium is an alkali metal with a very low work function (approximately $2.3 \ eV$ to $2.7 \ eV$).Because of this low work function,the threshold frequency of Sodium lies in the visible region,not the ultraviolet region.Therefore,the correct option is $D$.

Threshold frequency of which of the following metals does not lie in the ultraviolet region (in the case of the photoelectric effect)?

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