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  4. The work function of tungsten is 4.50 eV. The wavelength of fastest electron emitted when light whose photon energy is 5.50 eV falls on tungsten surface, is

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Q. The work function of tungsten is $4.50\, eV$. The wavelength of fastest electron emitted when light whose photon energy is $5.50\, eV$ falls on tungsten surface, is

Dual Nature of Radiation and Matter

Solution:

$KE _{\max }=\frac{h c}{\lambda}-w_{0}=5.5-4.5$
$\therefore KE _{\max }=1 eV$
$\lambda=\frac{h}{\sqrt{2 m E}}$