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NEET 2019 · Specific Heats of Gases - Cp, Cv, γ & Mayer's Relation

Specific Heats of Gases - Cp, Cv, γ & Mayer's Relation question from NEET 2019

Q50NEET 2019Medium

Specific Heats of Gases - Cp, Cv, γ & Mayer's Relation

The value of $\gamma \left(= \frac{C_p}{C_v}\right)$ , for hydrogen, helium and another ideal diatomic gas X (whose molecules are not rigid but have an additional vibrational mode), are respectively equal to,

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Answer: (b)

Hydrogen (rigid diatomic): $C_V = \dfrac{5}{2}R$ , $\gamma = \dfrac{7}{5}$ .
Helium (monoatomic): $\gamma = \dfrac{5}{3}$ .
Gas X (one vibrational mode): $C_V = \dfrac{7}{2}R$ , $C_P = \dfrac{9}{2}R$ , $\gamma = \dfrac{9}{7}$ .
So the answer is (b) $\dfrac{7}{5}, \dfrac{5}{3}, \dfrac{9}{7}$ .

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