For two gases, A and B with molecular weights `M_(A)` and `M_(B)`. It is observed that at a certain temperature. T, the mean velocity of A is equal to the root mean square velocity of B. thus the mean velocity of A can be made equal to the mean velocity of B, if:

Options

A. A is at temperature, T and B at T', T gt T'
B. A is lowered to a temperature `T_2 lt T` while B is at T
C. Both A and B are placed at lower temperature
D. Both A and B are placed at lower temperature

Answer

B