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_(1)` and B and `T_(2)T_(1)gtT_(2)`
B. A is lowered to a temperature `T_(2)ltT` while B is at T
C. Both A and B are raised to a higher temperature
D. Both A and B are lowered in temperature.

Answer

b