Teaching Haryana (HPSC) Assistant Professor Mock Test 2025 Physical Sciences Thermodynamic and Statistical Physics
The total number of phonon modes in a solid of volume V is \(\int_{\rm{0}}^{{\rm{ω_ D}}} {{\rm{g}}\left( {\rm{ω }} \right)\,} {\rm{dω }}\) = 3N, where N is the number of primitive cells, ωD is the Debye frequency and density of photon modes is g(ω) = AVω2 (with A > 0 a constant). If the density of the solid doubles in a phase transition, the Debye temperature θD, will
1
increase by a factor of 22/3
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increase by a factor of 21/3
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decrease by a factor of 22/3
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decrease by a factor of 21/3
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