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The alkali metal widely used in photoelectric cells is

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

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The alkalimetal widely used in photoelectric cells is Cs.
Hence (c) is the correct answer.
answered Jan 27, 2014 by sreemathi.v
 
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