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(B) The photoelectric effect depends on the work function of the metal. $Cs$ (Cesium) has the lowest ionization energy among the alkali metals,making

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(B) The photoelectric effect depends on the work function of the metal. $Cs$ (Cesium) has the lowest ionization energy among the alkali metals,making it the most suitable for use in photoelectric cells. While other alkali metals like $Na$ and $Rb$ can exhibit the photoelectric effect,$Cs$ is the standard choice for such applications due to its low work function. Therefore,only $1$ metal $(Cs)$ is typically cited for this specific application in the context of this question.

Among the following,the number of metals that can be used as electrodes in a photoelectric cell is $.......$ (Integer answer)
$A. Li$
$B. Na$
$C. Rb$
$D. Cs$

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Among the following,the number of metals that can be used as electrodes in a photoelectric cell is $.......$ (Integer answer)$A. Li$$B. Na$$C. Rb$$D. Cs$