Two diatomic gases A and B of masses 12 g and 32g occupy volumes of 1200 ml and 1920 ml , respectivey . When sound waves are passed through these gases , in which gas does sound travel with least velocity and also by how many times ? Assume that the pressure and temperature are same in both the gases .

Explanation

(i) Dependence of velocity of sound on density of a gas .
(ii) `V alpha (1)/(sqrtd) , d = (m)/(V)`
(iii) Gas B , `V_(A)= 1.3 V_(B)`