Somewhere in your course materials you should find the equation
Vrms = sqrt(3*k*T/m)
where k is the Boltzmann constant, 1.38*10^-23 J/K . It is equal to the molar gas constant R divided by Avogadro's number.
The surface of the sun has a temperature of about 6.0 103 K. This hot gas contains hydrogen atoms (m = 1.67 10-27 kg). Find the rms speed of these atoms.
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