Q. The molar specific heat at constant pressure of an ideal gas is (7/2)R. The ratio of specific heat at constant pressure to that at constant volume is :
A) 7/5
B) 6/7
C) 9/7
D) 4/7
Explanation
[Solution from source] For an ideal gas Cv = Cp − R = (7/2)R − R = (5/2)R. Hence γ = Cp/Cv = (7/2)/(5/2) = 7/5, as for a diatomic gas. A ratio below 1 is impossible because Cp is always larger than Cv. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.