The incorrect formula for the specific heat of an ideal gas in terms of specific heat ratio of a gas and universal gas constant is_____(a) cp-cv=2R(b) \(\frac {c_p}{c_v}\)=γ(c) cv=\(\frac {R}{\gamma -1}\)(d) cp=\(\frac {\gamma R}{\gamma -1}\)The question was posed to me in a job interview.My doubt is from A Brief Review of Thermodynamics in portion Compressible Flow – Preliminary Aspects of Aerodynamics

The incorrect formula for the specific heat of an ideal gas in terms o

1.	The incorrect formula for the specific heat of an ideal gas in terms of specific heat ratio of a gas and universal gas constant is_____(a) cp-cv=2R(b) \(\frac {c_p}{c_v}\)=γ(c) cv=\(\frac {R}{\gamma -1}\)(d) cp=\(\frac {\gamma R}{\gamma -1}\)The question was posed to me in a job interview.My doubt is from A Brief Review of Thermodynamics in portion Compressible Flow – Preliminary Aspects of Aerodynamics
Answer» The correct choice is (a) CP-cv=2R Easiest explanation: The SPECIFIC heat ratio of a gas is defined as the ratio \(\frac {c_p}{c_v}\) and the difference in cp and cv is defined as the universal gas constant. From these, the FOLLOWING RELATIONS for the specific heat of an ideal gas are obtained cp=\(\frac {\gamma R}{\gamma -1}\) and cv=\(\frac {R}{\gamma -1}\).

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