The emission of electrons from a metal surface exposed rto light radaition of appropriate wavelength is called photoelectric effect .The emmited electron are called photo=-weklectron work function of threshold energy may be defined as the minimum amount of energy required to ejected electron from a most surface .According to Einstein
Maximum kinetic energy of ejected electron = Absorbed energy - Work function
`(1)/(2) mv_(max)^(2) = h(v) - h(v_(n)) = hv [(1)/(lambda) - (1)/(lambda_(n))]`
Where `v_(n)` and `lambda_(0)` are thereshold frequency and threshold wavelength respectively
Sopping potential : it is the miximum potential at which the photoelectric current becomes zero if `V_(0)` is the stopping potential `eV_(0) = h(v- v_(0))`
In the photoelectric currect effect the shape of strainght line graph between stopping potential `(V_(0))` and frequency of incident light (V) gves

Options

A. charge on electron
B. work function of emitter
C. planck's constant
D. ratio of plank's constant to charge on electron

Answer

D