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Home  >>  JEEMAIN and NEET  >>  Chemistry  >>  s-Block Elements

The alkali metal widely used in photoelectric cells is

$\begin{array}{1 1}(a)\;K&(b)\;Rb\\(c)\;Cs&(d)\;Na\end{array}$

1 Answer

Alkali metals used to have low ionisation enthalpies and therefore, the electrons are easily ejected when exposed to light. Among alkali metals, cesium has lowest ionisation enthalpy and hence it can show photoelectric effect to the maximum extent and therefore preferred in photoelectric cell.
The alkali metal widely used in photoelectric cells is Cs.
Hence (c) is the correct answer.
answered Jan 27, 2014 by sreemathi.v
edited Feb 26 by sharmaaparna1
 
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