What is Photoelectric effect explain the working of a photoelectric cell state any four laws of photoelectric emission
Answers
Explanation:
ANSWER
Photo electric effect: When some photosensitive substances are exposed to ultraviolet light, electrons are ejected from their surface which are called photoelectrons. This process is called photoelectric emission.
Laws of photoelectric emission:
(i) There is a definite cut off value of frequency below which electrons cannot be ejected by any substance.
(ii) Number of emitted electrons are directly proportional to the intensity of light incident.
(iii) Kinetic energy of emitted electrons depends on the frequency of incident light on substance.
(iv) There is no time logging between the incident of light and emission of electrons
Answer:
i. For a given photoelectric material and frequency photoelectric current is directly proportional to intensity of incident radiation.
ii. For a given photoelectric material and frequency saturation current is directly proportional to intensity of incident radiation while stopping potential is independent of it
iii. Fir a given photoelectric material there exist a minimum frequency below which emission is not possible called threshold frequency. The stopping potential along with the kinetic energy increases linearly with frequency but is independent of intensity.
iv. Photoelectric emission is an instantaneous process.