The average velocity of gas molecules is 425 m/sec. Calculate its most probable velocity ump  at the same temperature.

Average velocity,u-=425ms− Most probable velocity, ump=?We know: u¯=8RTπM1/2;ump=2RTM1/2Hence, umpu-=2RTM×πM8RT1/2=π41/2∴umpu-=227×41/2=(0.7857)1/2=0.886∴ u=0.886×425ms−=376.55ms−