Thermodynamics - GATE practice papers - Mechanical for Q. 378

Q.  What is the relation between the specific heat of gas at constant pressure (Cv) and the specific heat of gas at constant volume (Cp) at the absolute zero point? (Marks: 02)
- Published on 19 Oct 15

a. (Cp) > (Cv)
b. (Cp) < (Cv)
c. (Cp) = (Cv)
d. unpredictable

ANSWER: (Cp) = (Cv)
 
The entropy is zero at the absolute zero. Also the value of γ is 1 at the absolute zero. γ = 1 = Cp/ Cv
Therefore (Cp) = (Cv) at absolute zero

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