The emission of electrons from the surface of metal when a beam of light with sufficiencly high frequency incident on it is called as photoelectric effect.
Lenard studied the photo electric photometric phenomena in 1900 A.D its process and resuits described . It consists of an evacuated tube containing two electrodes and a window through light can be enter and incident on one electrodes varying potetial differnce can be applied between two electrodes by help ofrheostat and sheel. Beam of light of various frequency and intenties are allowed to incident an electrode on electrode and the enjection of electode is obserbed by nothing current in ammeter.
LENARD FOUND THE THREE RESULTS BE WHICH ARE GIVEN BELOW:
- Photometric effect occurs only when light of sufficient frequency whose value depends on nature of metal surface , incident on metal surface. The minimum frequency for which photometric effect frequewncy of metal surface.
- The number of photoelectrons emitting per second depends on the intencity of incident light doesnot depends on frequency of incident light.
- The kinetic energy of photoelectrons emitted from metal surface depends on the frequency of incident on intensity of incident light .
No comments:
Post a Comment