A photoelectric surface is illuminated successively by monochromatic light of wavelengths $\lambda $ and ${\lambda \over 2}.$ If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface is :

Question

${{hc} \over {3\lambda }}$

${{hc} \over {2\lambda }}$

${{hc} \over {\lambda }}$

${3\,{hc} \over {\lambda }}$

Solution

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