UPSEE Solved Model Paper 1

Two gases A and B present separately in two vessels X and Y at the same temperature with molecular weight M and 2M respectively are effused out. The orifice in vessel X is circular while that in Y is a square. If the radius of the circular orifice is equal to that of the length of the side of square orifice, the ratio of rates of effusion of gas A to that of gas B is: