1.

If the degrees of freedom of a gas are f, then the ratio of its specific heats (C_(p))/(C_(v)) is given by :

Answer»

<P>`1-(2)/(f)`
`1+(2)/(f)`
`1+(1)/(f)`
`1-(1)/(f)`

Solution :`C_(v)=f cdot (1)/(2) R`
`C_(P) =C_(v)+R =(1)/(2) f R+R =((f)/(2)+1)R`
`therefore gamma =(C_(P))/(C_(v))=((f)/(2)+1)(R)/((f)/(2) cdot R)=1+(2)/(f)`
Thus, CORRECT choice is (b).


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