JEE Main 2017 · 2 Apr · Shift 1 · Physics Q10

PhysicsSingle correct+4 / -1Question 10 of 90

$C_p$ and $C_v$ are specific heats at constant pressure and constant volume respectively. It is observed that

$C_p-C_v=a$ for hydrogen gas

$C_p-C_v=b$ for nitrogen gas

The correct relation between a and b is :

a=\dfrac1{14}b

a = b

a = 14 b

a = 28 b

Answer and worked solution

Official answer: C

Per unit mass, $C_p-C_v=\dfrac RM$ . So $a=\dfrac R2$ for $\ce{H2}$ and $b=\dfrac R{28}$ for $\ce{N2}$ , giving $a=14b$ .

JEE Main 2017 · 2 Apr · Shift 1, Physics question 10