suppose a gas sample in all have 6*1023 molecules. each 1/3 of the molecules have r.m.s. speed 104 cm/sec, 2*104 cm/sec, 3*104 cm/sec. calculate the r.m.s. speed of gas molecules in sample.
Urms= sq. Root of {( 10^8 + 4×10^8 + 9×10^8)÷3}
=sq.root of {(14×10^8)÷3}
=2.16×10^4 cm/ s Ans.