explain stopping potential and threshold frequency in photoelectric emission
Answers
Answer:
Threshold frequency is the minimum frequency of the incident light which can cause the ejection of electrons without giving them additional energy. The amount of potential that is required to stop the electron having the maximum kinetic energy from moving is known as stopping potential.
Answer:
Threshold frequency: The minimum frequency of incident radiation, which can eject electrons from a metal, is called threshold frequency. Below threshold frequency, there is no photoelectric emission.
Stopping potential: The minimum negative potential given to the anode of a photocell for which the photoelectric current becomes zero is called stopping potential.
(i) The increase of frequency of incident radiation has no effect on the photoelectric current.
(ii) The photoelectric current increases proportionally with the increase in intensity of incident radiation.