A) monoatomic
B) diatomic
C) polyatomic
D) mixture of diatomic and polyatomic molecules
Correct Answer: A
Solution :
From Mayor's formula, \[{{C}_{P}}-{{C}_{V}}=R\] .....(i) where R is gas constant. Also, \[\gamma =\frac{{{C}_{P}}}{{{C}_{V}}}\] .....(ii) From Eqs. (i) and (ii), we have \[\gamma -1=\frac{R}{{{C}_{V}}}\] Given, \[\frac{R}{{{C}_{V}}}=0.67\] \[\therefore \] \[\gamma =0.67+1=1.67\] Hence, gas is monoatomic.
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