For two gases, A and B having molecular weight MA and MB , it is observed that at a certain temperature T, the mean speed of A is equal to the root mean square speed of B. The mean speed of A can be made equal to the mean speed of B, If
(A) A is at temperature T and B at T1 (T = T1 )
(B) A is lowered to temperature T2 = 8/3π[T is temperature of B]
(C) Both A and B are raised of a higher temperatrue
(D) Both A and B are placed at lower temperatrue.
