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If hydrogen gas is heated to a very high temperature, then the fraction of energy possessed by gas molecules correspond to rotational motion–(1)3/5, (2)2/7, (3)3/7, (4)2/5.
Asked by patra04011965 | 21 Jun, 2019, 13:28: PM
answered-by-expert Expert Answer
At Normal temperature diatomic molecules have 3 degrees of freedom corresponds to translation along 3 direction
and 2 degrees of freedom corresponds to rotational motion along two roataional axis
which are perpendicular to axis of diatomic  molecule.
 
At high temperature , diatomic molecules vibrate, giving rise to additional one dynamic degree of freedom.
This vibrational dynamic degree of freedom has two energy modes, namely, potential energy and kinetic energy of vibrator.
 
Hence at high temperature, diatomic molecules have 7 thermal degrees of freedom.
 
Hence fraction of energy correspond to rotation is 2/7
Answered by Thiyagarajan K | 21 Jun, 2019, 14:58: PM

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