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The binding energy of electrons in a metal is 250KJ/mol.What is the threshold frequency of metal ?

$\begin{array}{1 1}(a)\;6\times 10^{14}sec^{-1}&(b)\;7\times 10^{14}sec^{-1}\\(c)\;6\times 10^{-10}sec^{-1}&(d)\;4\times 10^{14}sec^{-1}\end{array}$

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