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The work function of a metal is 4.2 eV ,...

The work function of a metal is `4.2 eV` , its threshold wavelength will be

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To find the threshold wavelength (\( \lambda_0 \)) of a metal given its work function (\( W_0 \)), we can use the formula: \[ W_0 = \frac{hc}{\lambda_0} \] where: - \( h \) is Planck's constant, ...
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