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PH 122 (46)
Lecture

Quantum mechanics, photon model, photoelectric effect

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Department
Physics
Course
PH 122
Professor
Brian Jones
Semester
Spring

Description
31 March Quantum Mechanics Light has a particle nature. This is most clearly shown by the photoelectric effect. Particles have a wave nature. All of the wave phenomena we have seen apply to particles as well. Quantum principles are well understood and well accepted. The photon model 1240 E (in eV) = λ(¿nm) 1240 λ (in nm) = E(¿eV) The Photoelectric Effect There is a threshold frequency. Above it, electrons are emitted. Not below it Changing the accelerating voltage changes the current, but only within certain limits The Work Function How much it “costs” to release an electron This varies with the electrode Diffraction and Interference Destructive interference occurs where a crest overlaps a trough Constructive interference occurs where two crests overlap Double Slit Interf
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