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Thermal Physics

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26 Jul 2009 10:08:01 IST

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If Cv=5R/2 then y (which is specific heat ratio or gamma which) = Cp/Cv for diatomic gas is7/2

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If Cv=5R/2 then y (which is specific heat ratio or gamma which) = Cp/Cv for diatomic gas is

7/2

7/5

7/34

35/4

pleaze kindly solve it out for me >>>thanx

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djdylan2000. bits goa eee

Blazing goIITian

Joined: 7 Feb 2007

Posts: 1608

26 Jul 2009 10:11:37 IST

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Use this other known eqn dude:

Cp=Cv+R

So γ=Cp/Cv

Cp=Cv+R= 5R/2+R=7R/2

Cv= 5R/2.

therefore, γ=7/5

Deepak Aggarwal

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Joined: 9 May 2009

Posts: 766

26 Jul 2009 15:58:30 IST

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Cp / Cv = Gamma = N + 2 / N where N = 3A - R, where further A = number of molecules and R = number of bonds.

For monoatomic, N = 3 and so Gamma = 5/3. For diatomic, N = 5 and Gamma = 7/5 and so on. To calculate values of Cp and Cv separately, use Mayer's relation i.e. Cp - Cv = R.

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