Dust particles are pulverized rock, which has density 2500 kg/m3. They are approximately spheres 20 ?m in diameter
Treating dust as an ideal gas, what is the root-mean-square speed (thermal speed) of a dust particle at (The Boltzmann constant is 1.38 × 10-23 J/K.)
A) 5.2 × 10-5 m/s
B) 1.7 × 10-5 m/s
C) 3.0 × 10-5 m/s
D) 7.3 × 10-5 m/s
Answer: A
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