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Material Type: Notes; Professor: Farris; Class: Calculus Based Physics I; Subject: Physics; University: Volunteer State Community College; Term: Unknown 1989;
Typology: Study notes
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Classical Picture : (try to explain with Newton & Maxwell) Thermal motion of charged (electrons/ions) near the surface emit electromagnetic (EM) radiation like small antennas resonating. However, this predicts an increasing amount of radiation at shorter λ's that isn't seen in experimentsthe "ultraviolet catastrophe"
Enter Max Planck (1900), who proposed the following: each of these "resonators" can only have discrete energies
the energy comes out in discrete "packets" named photons (by Einstein, 1905) when a resonator changes energy levels.
40.3 The Compton Effect The scattering of (xray) photons off electrons.
classical view:
electrons accelerate in the direction of xray beam electrons will oscillate and emit Dopplershifted xrays over a spread of wavelengths
quantum view(collision of an xray "particle/photon" with e.)
elastic collision of 2 particles
momentum & energy of the incoming photon:
for the outgoing photon:
The electron also picks up some kinetic energy & momentum.
Apply conservation of momentum & kinetic energy
The classical picture and the quantum picture make
different, specific predictions about the scattered xrays.
Observations are consistent with the quantum picture & not
the classical picture> more evidence that energy is
energy is quantized & comes in "packets."
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