JEE Main 2020 (9 Jan, Shift 1) Physics Q8: Kinetic Theory

Question

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 (

C_V^A

and

C_V^B

) of gas A and B, respectively is :

(1) $3 : 5$
(2) $5 : 7$ Official answer
(3) $7 : 9$
(4) $5 : 9$

Official answer

Option 2

NTA final key (Jan 2020).

Accepted Answer

Option 2: $5 : 7$

Answer

$3 : 5$

Answer

$5 : 7$

Answer

$7 : 9$

Answer

$5 : 9$

JEE Main 9 January 2020, Shift 1, Physics Q8

Same idea in other shifts