Posted by **jan** on Friday, June 22, 2007 at 8:27pm.

A smoke particle undergoing Brownian motion in air has a mass of 2.00 x 10 -5 kg.

a) what is the its average velocity if the temperature is 300 K?

b) what is its average kinetic energy?

The average kinetic energy of a particle or molecule of any mass is

Eav = (3/2) k T

where k is the Boltzmann constant,

1.38^10^-23 J/K, and

T is the temperature in Kelvin

Once you have the average KE, get the average (actually, r.m.s) velocity from

(1/2) M V^2 = Eav

M is the particle mass

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