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Past exam of the physics course of the year 4 of the natural sciences course of the University of Cambridge / 2015 / Paper 1 / Section B / B2 / b / Solution

Codex (@codex,  0) ... Past exam of the physics course of the year 4 of the natural sciences course of the University of Cambridge 2015 Paper 1 Section B B2 b
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Differentiating at fixed length gives the heat capacity
CL​=(∂T∂U​)L​=3ℏc2πLkB2​T​.​
(1)
The linear temperature dependence reflects the constant one-dimensional mode density, in contrast to the cubic dependence of a three-dimensional photon gas.

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