What a photocell does?

On what factor the retarding potential of photocell depends?

What are the important applications of photocell?

If the intensity of incident radiations in a photocell is increased, how does the stopping potential vary?

How does the stopping potential applied to a photocell change if the distance between the light source and the cathode of the cell is doubled?

if the maximum k.E. of electrons emitted by a photocell is 4 eV, what is the stopping potential?

What is the stopping potential of a photocell, in which electrons with a maximum kinetic energy of 6eV are emitted?

State the influence of work function on kinetic energy of electrons emitted in a photocell. If the intensity of the incident radiation is doubled, what changes occur in the stopping potential and photoelectric current?