Question

Shankar’s Quantum Mechanics compares this phenomenon to an ideal laugh track, which causes others to laugh alongside it. For 10 points each:
[10m] Name this phenomenon which produces coherent photons and which is described with absorption by the Einstein “B” coefficient.
ANSWER: stimulated emission [prompt on atomic emission; do NOT accept or prompt on “spontaneous emission”]
[10e] During stimulated emission, the laser is in a population inversion because the majority of atoms are excited above this state, the lowest energy level for the system.
ANSWER: ground state
[10h] In population inversion, the state has this unusual property in which the entropy increases as the energy decreases. Systems with this property always emit heat, regardless of the surroundings.
ANSWER: negative temperature [accept negative absolute temperature; accept clear knowledge equivalents]
<IC, Physics>

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Summary

2023 ILLIAC (Cornell)2023-10-21Y417.50100%50%25%
2023 ILLIAC (Mainsite)2023-10-21Y812.5088%13%25%

Data

Rochester BRochester C010010
Cornell EarthColumbia Ly-α010010
Cornell FireCornell Wind1010020
Rochester ARIT10101030