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How many degrees of freedom is there for a CO2 molecule with rotational kinetic energy?(a) 1(b) 2(c) 3(d) 6The question was asked in a national level competition.The above asked question is from Microscopic Description of Gases in portion Properties of High Temperature Gases of Aerodynamics

Answer»

The correct OPTION is (b) 2

The best explanation: CO2 is a linear POLYATOMIC molecule that has similar properties as the diatomic molecule having rotational kinetic energy. The MOMENT of inertia for the molecule in z – axis is negligible SMALL compared to x and y – axis. Due to this reason, diatomic and even linear polyatomic molecules have only two thermal degrees of freedom.



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