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# Which of the following is correct for the molecules of a gas in thermal equilibrium ?

(a) All have the same speed (b) All have different speeds which remains constant .(c) They have a certain constant average speed. (d) They do not collide with one another

Answer : They have a certain constant average speed.
Explanation :
$V_{av}=\sqrt{\large\frac{8KT}{\pi M}}$
They have a certain constant average speed.