Question

Average velocity of a gas becomes 4 times. What will be the effect on rms velocity at the same temperature?

(a) 1.4 times

(b) 4 times

(c) 3 times

(d) 2 times

I have been asked this question during an online interview.

My question comes from Ideal Gases in chapter Kinetic Theory of Gases of Engineering Physics I

Answer 1

The correct answer is (b) 4 times

To explain: v=0.92vrms

vrms=1/0.92×v

When v becomes 4 times,

(vrms)^‘=4/0.92×v=4vrms.