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At low temperatures, the Debye temperature of two, isomorphous (closely similar in shape) ionic solids AB...

At low temperatures, the Debye temperature of two, isomorphous (closely similar in shape) ionic solids AB and CD are 400 K and 300 K respectively. The lattice heat capacity of AB at 5K is 0.03 J/mol K. Estimate the heat capacity of CD at 5K and that of AB at 3K.

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