Question

In an experiment of photoelectron emission by laser beam from a particular semiconductor photodiode surface (the work function is 1.82 eV), is it possible to emit photoelectrons by a laser beam with wavelength 550 nm?

Answer 1

Answer:

Work function of the metal is 4.2 eV;

Given: λ=330nm.

The energy of incident photon is given by,

E=hc/λ

E=

330×10

−9

6.63×10

−34

×3×10

8

E=6×10

−19

J or 3.79eV

E is less than work function.

Hence, no photoelectric emission will take place.