Vrms = sqrt [ 3 k T /m ]
=sqrt (3*1.38*10^-23 *298 / 1.89*10^-17)
=sqrt(653 *10^-6)
25.5*10^-3
= .0255 m.s
A smoke particle has a mass of 1.89 10-17 kg and it is randomly moving about in thermal equilibrium with room temperature air at 25° C. What is the rms speed of the particle?
cm/s
1 answer