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if the threshold wavelength for the given metal is `4 xx 10^(-7)`m ,What is the photoelectric work function for a metal ?

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The photoelectric work function for the metal`=(hc)/(lambda_(0)) = (6.63 xx 10^(-34))(3 xx 10^(8))/(4 xx 10^(-7)) = 4.97 xx 10^(-19)` J
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