The work function of tungsten is \( 4.50 \mathrm{eV} \). The wavelength of fastest electron emit...

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The work function of tungsten is \( 4.50 \mathrm{eV} \). The wavelength of fastest electron emitted when light
\( \mathrm{P} \) whose photon energy is \( 5.50 \mathrm{eV} \) falls on tungsten

W surface, is
(1) \( 12.27 \mathrm{~A} \)
(2) \( 0.286 \mathrm{~A} \)
(3) \( 12400 \mathrm{~A} \)
(4) \( 1.227 \mathrm{~A} \)
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