Dust Particles Are Pulverized Rock, Which Has Density 2500 Kg/m³

question 31

Multiple Choice

Dust particles are pulverized rock, which has density 2500 kg/m³. They are approximately spheres 20 μm 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

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