Question: Calculate the temperature at which the photon energy density in a solid will exceed the phonon energy density in the same solid, if the solid

Calculate the temperature at which the photon energy density in a solid will exceed the phonon energy density in the same solid, if the solid has a Debye temperature of 300 K, phonon velocity of 4 × 10⁵ cm/s, and an index of refraction of n = 2, assuming that the solid does not melt.

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