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JEE Main & Advanced JEE Main Paper Phase-I (Held on 09-1-2020 Morning)

  • question_answer
    Consider two ideal diatomic gases A and B at some temperature T. Molecules of the gas A are rigid, and have a mass m. Molecules of the gas B have an additional vibrational mode, and have a mass\[\frac{m}{4}\]. The ratio of the specific heats \[\left( C_{V}^{A}\,\,\text{and}\,\,C_{V}^{B} \right)\] of gas A and B, respectively is: [JEE MAIN Held on 09-01-2020 Morning]

    A) 3 : 5

    B) 7 : 9

    C) 5 : 7

    D) 5 : 9

    Correct Answer: C

    Solution :

    [c] \[C_{V}^{A}=\frac{5R}{2}\]
    \[C_{V}^{B}=\frac{7R}{2}\]
    \[\frac{C_{V}^{A}}{C_{V}^{B}}=\frac{5}{7}\]


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