Write any three experimental observations of photoelectric effect

Explanation

The phenomenon of emission of electrons from a metal surface under the influence of `"radiation" // "light"` of suitable frequency.
(i) PEE is Instantaneous.
(ii) There exists a minimum frequency of incident radiation below which No PEE takes place, is called threshold frequency.
(iii) Photoelectric current is directly proportional to the intensity of incident radiation.
(iv) The kinetic energy of the emitted photoelectrons increases with the increase in frequency of radiation above threshold frequency.
(v) The minimum retarding potential of the anode at which the photoelectrons are stopped in reaching `"anode" // "photoelectric"` current becomes zero, is called stopping potential.