Physics · 2019
JEE Main · 9 April 2019, Shift 2 · Q12
The specific heats, C_P and C_V of a gas of diatomic molecules, A, are given (in units of J mol^-1 K^-1 ) by 29 and 22, respectively. Another gas of…
The specific heats, $\displaystyle C_P$ and $\displaystyle C_V$ of a gas of diatomic molecules, A , are given (in units of $\displaystyle \mathrm{J} \mathrm{mol}^{-1} \mathrm{~K}^{-1}$ ) by $\displaystyle 29$ and $\displaystyle 22$, respectively. Another gas of diatomic molecules, B, has the corresponding values $\displaystyle 30$ and 21. If they are treated as ideal gases, then :
Official answer
(1)
A has a vibrational mode but B has none.
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JEE Main 2019 Physics question, with the answer from NTA’s final answer key. Where our answers come from.