Kinetic Theory - Result Question 23
23. The value of $\gamma=(\frac{C_p}{C_v})$, for hydrogen, helium and another ideal diatomic gas $X$ (whose molecules are not rigid but have an additional vibrational mode), are respectively equal to,
[NEET Odisha 2019]
(a) $\frac{7}{5}, \frac{5}{3}, \frac{7}{5}$
(b) $\frac{7}{5}, \frac{5}{3}, \frac{9}{7}$
(c) $\frac{5}{3}, \frac{7}{5}, \frac{9}{7}$
(d) $\frac{5}{3}, \frac{7}{5}, \frac{7}{5}$
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Answer:
Correct Answer: 23. (b)
Solution:
- (b) For Hydrogen $f=5$
For Helium $f=3$
For gas $X$
$f=7$.
$\gamma=1+\frac{2}{f}=1+\frac{2}{7}=\frac{9}{7}$
So, $(\frac{7}{5}, \frac{5}{3}, \frac{9}{7})$
