Lecture #15 - Chemistry 2A-c W2009(Ch8-22)118 THE...

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1 THE PHOTOELECTRIC EFFECT light electron metal KE of electron Frequency of light ( ν ) ν 0 When v < v 0 , no electrons are ejected at any light intensity. KE of the ejected electrons depends only on the light’s frequency (v) When v > v 0 , the number of electrons is proportional to the light intensity. This lead Einstein to use Planck’s idea of quanta and postulate: “Electromagnetic radiation can be viewed as a stream of particle-like units called photons .” Kinetic energy =KE = (½)m e v 2 = h ν - h ν o = E – E 0 Chemistry 2A Chemistry 2A - c W2009 c W2009 (Ch8 (Ch8 - 22)118 22)118
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