Download Class 10

Modern Physics
(PC300)
Class #10:
1) Experimental basis for the Introduction of Quantum Theory
a) Photoelectric Effect
b) X-Ray Production
c) Charge/mass of an electron
d) Blackbody Radiation
Ultraviolet Catastrophe
Stefan-Boltzmann Law
Wien’s Displacement Law
2) Gamma Rays…the ultimate photon
How do gamma particles get detected…
how do they interact with matter?
Quantum Homework Questions
Blackbody and gamma
spectroscopy
questions.
Also some from
Thornton and Rex–
Due Wednesday
"Yeah, well I got mine first
Experimental basis for the introduction of a quantum theory.
Photoelectric Effect – Almost done
X-Ray Production
Charge/mass of an electron
Blackbody Radiation
Stefan-Boltzmann law
Wien’s Displacement Law
Ultraviolet Catastrophe
Review what we know about how gamma particles are absorbed by matter.
Photoelectric effect
Compton Scattering
Pair Production
Ultraviolet Catastrophe
Classical Physics – Rayleigh-Jeans Law
u( f , T )  8kT
4
1900 - Planck’s Law
Unusual (Crick-Watson) type approach:
-> Equation that fits data
-> Make it work
-> Could not justify finding
1918 Planck - Nobel Prize
How do we detect gamma rays?
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Review:
What is each peak?
Why are they there?
Calculate the location of the Compton edges and backscattering!