What is the work function of the metal, if the light of wavelength \( 4000 \AA \) generates phot...
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0What is the work function of the metal, if the light of wavelength \( 4000 \AA \) generates photoelectron of velocity
P \( 6 \times 10^{5} \mathrm{~ms}^{-1} \) from it?
W
(Mass of electron \( =9 \times 10^{-31} \mathrm{~kg} \)
Velocity of light \( =3 \times 10^{8} \mathrm{~ms}^{-1} \)
Plancks constant \( =6.626 \times 10^{-34} \mathrm{Js} \)
Charge of electron \( \left.=1.6 \times 10^{-19} \mathrm{JeV}^{-1}\right) \quad(2019 \) Main, 12 Jan I)
(a) \( 4.0 \mathrm{eV} \)
(b) \( 2.1 \mathrm{eV} \)
(c) \( 0.9 \mathrm{eV} \)
(d) \( 3.1 \mathrm{eV} \)
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