Physics · 2015
NEET 2015 · 25 July · Code C · Q1
A photoelectric surface is illuminated successively by monochromatic light of wavelength λ and (λ)/2. If the maximum kinetic energy of the emitted…
A photoelectric surface is illuminated successively by monochromatic light of wavelength $\displaystyle \lambda$ 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 of the material is :
($\displaystyle \mathrm{h}=$ Planck's constant, $\displaystyle \mathrm{c}=$ speed of light)
Official answer
From NTA’s final answer key for this paper.
(3)
$\displaystyle \frac{\mathrm{hc}}{2 \lambda}$
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