UPSEE Solved Model Paper 4

Velocity of sound in the gas is given by
v = √

γP

ρ

where
P is pressure, ρ is the density of the gas and γ =

CP

CV

is the ratio o specific heats at constant pressure to constant volume.
∴ γ =

3302×1.3

1.013×105

= 1.4
But, γ =

2+f

f

where f is the no degrees of freedom.
Solving 1.4 =

2

f

+1
∴

1

f

= 0.4
∴ f = 5