One mole of ideal monoatomic gas $(\gamma = 5/3)$ is mixed with one mole of diatomic gas $(\gamma = 7/5).$ What is $\gamma $ for the mixture$?$ $\gamma $ denotes the ratio of specific heat at constant pressure, to that at constant volume
  • A$3/2$
  • B$23/15$
  • C$35/23$
  • D$4/3$
AIEEE 2004,IIT 1986, Medium
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