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P-V plots for two gases during adiabatic...

`P-V` plots for two gases during adiabatic expansion are shown in figure. Plot `I` and `II` should correspond respectively to :

A

`O_(2)` and `N_(2)`

B

`O_(2)` and `He`

C

`He` and `O_(2)`

D

`He` and `Ar`

Text Solution

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The correct Answer is:
B
`PV^(5//3)=`const (for `He,gamma=5/3`)
`PV^(7//5)=` const. (for `O_(2), gamma=7/5`)
`:.` for the same decrease in `V`
`P_(O_(2)) lt P_(He))`
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