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The specific heat ratio for air at ordinary temperatures is taken as

  • A.1.67
  • B.1.2
  • C.1.4
  • D.1.0

Answer: C

Air is predominantly diatomic, and 1.4 follows from the translational and rotational degrees of freedom being active while the vibrational ones are largely frozen out at ordinary temperatures. Monatomic gases give 1.67, and the value for air falls below 1.4 at high temperature as vibration is excited.

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