The molar specific heat at constant pres...

The molar specific heat at constant pressure of an ideal gas is `7/2R`. The ratio of specific heat at constant pressure to that at constant volume is ……….

`8/7`

`5/7`

`9/7`

`7/5`

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The correct Answer is:

`C_P=7/2R`
`C_P-C_V=R`
`7/2R-C_V=R`
`therefore 7/2R-R=C_V`
`therefore C_V=5/2R`
`therefore C_P/C_V=(7/2R)/(5/2R)=7/5`

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