1.

A polyatomic gas has f virational degrees of freedom, then the ratio of the specific heat at constant pressure to that at constant volume will be

Answer»

<P>`(4 + f)/(3 +f )`
`(4-f)/(3-f)`
`(3+f)/(4+f)`
`(3-f)/(4-f)`

Solution :For a POLYATOMIC atom value of specific heat at constant volume, `C_(v) = (3+ f) R` where, f = VIBRATION DEGREE of freedom and `R =` gas constant.
Now, `C _(p) = C_(v) + R`
` C _(P)= (3+ f) R+R`
`C_(p) = (4+f) R`
Now, ratio of `C _(p) and C_(v)`
`(C_(p))/(C_(v)) = (4+f )/(3+ f)`


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