Thermodynamics Question 322

Question: P-V plots for two gases during adiabatic process are shown in figure. Plots 1 and 2 should correspond, respectively, to

Options:

A) He and O2

B) O2 and He

C) He and Ar

D) O2 and N2

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Answer:

Correct Answer: B

Solution:

[b]Slope of adiabatic curve γ

1Atomicityofthegas .

So, γ is inversely proportional to atomicity of the gas.

[as γ=1.66 for monoatomic gas, γ=1.4 for diatomic gas, and γ=1.33 for triatomic non-linear gas.]

From the graph it is clear that slope of curve 1 is less, so this should be adiabatic curve for diatomic gas (i.e., O2 ).

Similarly, slope of curve 2 is more, so it should be adiabatic curve for monoatomic gas (i.e. He).



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