Photoelectrons are observed when a metal surface is illuminated by light with a wavelength 437 nm. The stopping potential for the photoelectrons in this experiment is 1.67V.
a. What is the work function of the metal, in eV?
b. What type of metal is used in this experiment?
c. What is the maximum speed of the ejected electrons?
Energy of the light beam
As the stopping potential is equal to 1.67 V, so the maximum kinetic energy of the ejected electrons is
From the energy conservation in Photoelectric effect we know that, for a surface having work function W,
So, the work function of the metal is
For non-relativistic limit , the kinetic energy relation is given by
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