CHEM 1211K Lecture Notes - Lecture 1: Photon, Radiant Energy, Barium
Document Summary
Topic 48 : the photoelectric effect h = 6. 626 10-34 j . It was observed that metals can eject electrons when a light shines on their surface . This is called the photoelectric effect : experimental observations indicate the following : A minimum frequency was needed before electrons would be emitted regardless of the intensity called the threshold frequency : but wait ! More intense light should mean more energy . Yet no matter how bright they made some light , electrons would not be ejected . Frequency of light: no matter how intense the wave is it has to have a particular frequency before electrons are emmitted - threshold frequency. * all had to do with the frequency : einstein"sexplanat, einstein proposed that the light is a shower of particles ! Light energy is not continuous as once thought , but rather exists as discreet. The energy of a photon of light is directly proportional to its frequency .
