Solution to task 661 from Chertov's for extramural stud

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• Determine the heat Q required for heating a potassium crystal with a mass of m = 200 g from a temperature T1 = 4 K to a temperature T2 = 5 K. Take the characteristic Debye temperature for potassium ΘD = 100 K and consider the condition T << ΘD satisfied.