A gaseous mixture contains equal number of hydrogen and nitrogen molecules. Specific heat measurements on this mixture at temperatures below 100 K would indicate that the value of $\mathrm{\gamma }$ (ratio of specific heats) for this mixture is

1.  3/2

2.  4/3

3.  5/3

4.  7/5

3. Below 100 K only translational degree of freedom is considered. Hence

according to question,

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