Q. The work function of aluminium is $4.2\ eV.$ If two photons, each of energy $3.5\ eV$ strike an electron of aluminium, then emission of electrons will be
A) Possible
B) Not possible
C) Data is incomplete
D) Depends upon the density of the surface
Explanation
(b) For emission of electrons incident energy of each photon must be greater than work function (threshold energy)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.