Q. 94.9( 34 Votes )
In photoelectric effect, the energy of the incident photon must be equal to the sum of the metal's work function and the photoelectron kinetic energy:
E (photon)=KE (electron)+Φ
Where, E is total energy of incident light, KE is the kinetic energy of the photon and Φ is work function.
So, the physical quantity is work function of surface.
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