Wavelength of light produced by the argon laser, λ = 488 nm = 488 × 10−9 m
Stopping potential of the photoelectrons, V0 = 0.38 V
1eV = 1.6 × 10−19 J
Planck’s constant, h = 6.6 × 10−34 Js
Charge on an electron, e = 1.6 × 10−19 C
Speed of light, c = 3 × 10 m/s
From Einstein’s photoelectric effect, we have the relation involving the work function Φ0
of the material of the emitter as:
Therefore, the material with which the emitter is made has the work function of 2.16 eV.
