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Degrees of Freedom and Kinetic Theory of Gases

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Multiple Choice

How many degrees of freedom the gas molecules have if under STP the gas density $\rho = 1.3 kg/m^3$ and the velocity of sound propagation in it is $330 ms^{-1}$?

  1. $3$
  2. $5$
  3. $7$
  4. $8$