Fri March 01, 2013 By:

how will you account for five degree of freedom in a di - atomic molecule. using idea of equipartition of energy, find value of gamma(Y) for the same.

Expert Reply
Fri March 01, 2013
For a diatomic rigid molecule, p = 5 
from equipartition of energy:avg energy per molecule per degree of freedom=1/2 kT
total internal energy of 1 gm mole of di atomic gas=U=5/2 kTxN=5/2 RT....(1)
Cv=dU/dT =5/2 R.............(2)
Cp=7/2 R
so Y=7/5=1.4
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