Q: For a gas, the difference between the two principal specific heats is 4150 J/kg K. What is the specific heat of the gas at constant volume if the ratio of specific heats is 1.4 ?

(a) 5186 J/kg K

(b) 10375 J/kg K

(c) 1660 J/kg K

(d) 8475 J/kg K

Ans:(b)

Sol: C_{p}-C_{v} = 4150

C_{p}/C_{v} = 1.4,

C_{p} = 1.4 C_{v}

1.4 C_{v} – C_{v} = 4150

0.4 C_{v} = 4150

C_{v} = 4150/0.4

= 10375 J/kg K