Wave-Particle Duality of Light and Electrons

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Wave-Particle Duality of Light and Electrons


Lecture number:
33
Pages:
4
Type:
Lecture Note
School:
The University of Vermont
Course:
Phys 012 - Elementary Physics
Edition:
1
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Lecture 33 Outline of Last Lecture I. Photoelectric Effect a. Light ejects electrons from the back metal plate to create a current. Increasing voltage increases current. b. Observed Effects i. Maximum kinetic energy of electrons is independent of light intensity. ii. Electrons are emitted instantaneously, even at lower intensity. iii. No electrons are emitted below “cutoff frequency,” regardless of intensity. 1. fco = Wo/h 2. Wo = work function of metal (like binding energy, varies based on material) iv. Maximum possible kinetic energy increases with increasing frequency. 1. E = hf = KEmax + Wo 2. hc = 1240 eV*nm III. Compton Effect Physics 012 1st Edition



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