Question

If masses of all gas molecules of a gas are halved and their speeds are doubled then the ratio of initial
and final pressure will be

(1) 1:3
(2) 2:3
(3) 1:2
(4) 3:4

Answer=(3)​

Answer 1

The ratio between initial and final pressure is 2:1

Correct option is (3)

Explanation:

From the kinetic gas equation:

PV=1/3(mnc^2)

p = 1/3(mnc^2) / v

P' = 1/3 (m/2) (2c)^2/v

Now the ratio between initial and final pressure will be

p/p' = 1/3(mnc^2)/ 1/3 (m/2) (2c)^2/v

p/p'  = 2 : 1

Thus the ratio between initial and final pressure is 2 : 1

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Answer 2

Answer:

correct Answer is 1:2

Explanation:

Hope it will help you

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