A light source of wavelength \( \lambda \) illuminates a metal and ejects photo-electrons with (...

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A light source of wavelength \( \lambda \) illuminates a metal and ejects photo-electrons with (K.E.) \( \max _{\max }=1 \mathrm{eV} \)
 
Another light source of wavelength \( \frac{\lambda}{3} \), ejects photo-electrons from same metal with (K.E.) \( )_{\max }=4 \mathrm{eV} \)
Find the value of work function?
(a) \( 1 \mathrm{eV} \)
(b) \( 2 \mathrm{eV} \)
(c) \( 0.5 \mathrm{eV} \)
(d) None of these
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