The work function of metals is in the range of \( 2 e V \) to \( 5 \mathrm{eV} \). Find which of...

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The work function of metals is in the range of \( 2 e V \) to \( 5 \mathrm{eV} \). Find which of the following wavelength of light cannot be used for photoelectric effect. (Consider, Planck constant \( =4 \times 10^{-15} \mathrm{eVs} \), velocity of light \( =3 \times 10^{8} \mathrm{~m} / \mathrm{s} \) )
[WB JEE 2015]
(a) \( 510 \mathrm{~nm} \)
(b) \( 650 \mathrm{~nm} \)
(c) \( 400 \mathrm{~nm} \)
(d) \( 570 \mathrm{~nm} \)
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