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?
Answer:
No
Work function of the metal, 
Charge on an electron, e 
C
Planck’s constant, h
Js
Wavelength of the incident radiation, 
= 330 nm
m
Speed of light, c
m/s
The energy of the incident photon is given as:
It can be observed that the energy of the incident radiation is less than the work function of the metal. Hence, no photoelectric emission will take place.
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