The molecules of a given mass of a gas have r.m.s. velocity of 200 m s-1 at 27°C and 10 x 105N m-2 pressure. When the temperature and pressure of the gas are respectively,127°C and 0.05 x 105 N m-2, the r.m.s. velocity of its molecules in m s-1 is
(a) 100√2/3
(b) 100/3
(c) 100√2
(d) 400/√3