Question
The work function for a certain metal is 4.2 eV. Will this metal give photoelectric emission for incident radiation of wavelength 330 nm?
Solution
Work function of the metal, ɸ0 = 4.2 eV
= 4.2 x 1.6 x 10–19 J
= 6.72 x10–19 J
Wavelength of incident radiation, = 330 nm
Now, using the formula for energy of a photon,
As energy of incident photon E < ɸ0, hence no photoelectric emission will take place.
= 4.2 x 1.6 x 10–19 J
= 6.72 x10–19 J
Wavelength of incident radiation, = 330 nm
Now, using the formula for energy of a photon,
As energy of incident photon E < ɸ0, hence no photoelectric emission will take place.
