When the speed 'v' of a longitudinal wave in an ideal gas of pressure 'P' and density 'ρ' is expressed as v = √(γP/ρ). Here the value of 'γ' is taken as _______ for air.

When the speed 'v' of a longitudinal wave in an ideal gas of pressure

1.	When the speed 'v' of a longitudinal wave in an ideal gas of pressure 'P' and density 'ρ' is expressed as v = √(γP/ρ). Here the value of 'γ' is taken as _______ for air.
A.	5/3
B.	7/5
C.	5/7
D.	3/5
Answer» C. 5/7