The threshold wavelength for a metal of work -function W0 is λ0 The threshold wavelengthfor a metal having work-function 3 Wo will be

W0=hv0=hc/λ0 or W0∝1/λ0 W0W0′=λ0′λ0 or W03W0=λ0′λ0 λ0′=λ0/3

The threshold wavelength for a metal of work -function W0 is λ0 The threshold wavelengthfor a metal having work-function 3 Wo will be

W0=hv0=hc/λ0 or W0∝1/λ0 W0W0′=λ0′λ0 or W03W0=λ0′λ0 λ0′=λ0/3

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The threshold wavelength for a metal of work -function W₀is $λ$ ₀The threshold wavelength
for a metal having work-function 3 Wo will be

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$λ_{0}$

$λ_{0} / 3$

$λ_{0} / 4$

$λ_{0} / 2$

answer is C.

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$W_{0} = {hv}_{0} = hc / λ_{0} or W_{0} \propto 1 / λ_{0} \frac{W_{0}}{W_{0}^{'}} = \frac{λ_{0}^{'}}{λ_{0}} or \frac{W_{0}}{3 W_{0}} = \frac{λ_{0}^{'}}{λ_{0}} λ_{0}^{'} = λ_{0} / 3$

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The threshold wavelength for a metal of work -function W0 is λ0 The threshold wavelengthfor a metal having work-function 3 Wo will be

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The threshold wavelength for a metal of work -function W₀is $λ$ ₀The threshold wavelength
for a metal having work-function 3 Wo will be