Two metals A and B have work functions 4eV and 10eV respectively. Which metal has the higher threshold wavelength?
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Solution
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Work function $$W=hv_0=\dfrac{hc}{\lambda_0}$$ $$\Rightarrow \lambda_0\propto \dfrac{1}{W}$$ As $$W_A<W_B;(\lambda_0)_A>(\lambda_0)_B$$ i.e., threshold wavelength of metal A is higher.
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