Physics · 2016
JEE Main · 10 April 2016, Shift 1 · Q21
A photoelectric surface is illuminated successively by monochromatic light of wavelengths λ and (λ)/2. If the maximum kinetic energy of the emitted…
A photoelectric surface is illuminated successively by monochromatic light of wavelengths $\displaystyle \lambda$ and $\displaystyle \frac{\lambda}{2}$. If the maximum kinetic energy of the emitted photoelectrons in the second case is $\displaystyle 3$ times that in the first case, the work function of the surface is :
Official answer
(2)
$\displaystyle \frac{h c}{2 \lambda}$
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