Question

On what factor the retarding potential of photo cell depends?

Answer 1

Stopping potential is the negative potential given to the opposite plate at which the electrons having the highest kinetic energy is stopped. So, is e is the charge on electron and V is the stopping potential, eV is the maximum KE of the electron.
Therefore, stopping potential eVs = ½ m(vmax)2
Now, KE of the electron is given by Einstein’s photoelectric equation,
hν = ϕ + ½ m(vmax)2
 
ϕ is the work function
ν is the frequency of incident radiation
m is the mass of electron
vmax is the maximum velocity of the electron
 
=> hν = ϕ + eVs
=> Vs = ϕ/e + (hν)/e
 
Thus the stopping potential depends on:

The frequency of the incident radiation, ν.

Work function, ϕ, of the metal

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