ThermodynamicsHard

Question

p-V plots for two gases during adiabatic processes are shown in the 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

Solution

In adiabatic process
slope of p-V graph,   
       slope ∝ γ      [with negative sign]
From the given graph,
       (slope)2 > (slope)1
∴       γ2 > γ1
Therefore, 1 should corresponding to O2 (γ = 1.14) and 2 should correspond to He (γ = 1.67).

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