Question

How many degrees of freedom does the gas molecules have if under standard
conditions the gas density is 1.3 kg m
^(–3)
and the velocity of sound in it is
v = 330 m s^(–1) .

Answer 1

The gas density and the velocity of sound clearly indicate that the gas is air. 99% of air is copmosed of two-atomic molecules (nitrogen and oxygen). For two-atomic molecules the number of degrees of freedom is 5.