Answer
$6\times10^3m/s$
Work Step by Step
The rms speed is given by equation 13–9. Helium’s atomic mass is 4.0.
$$v_{rms}=\sqrt{\frac{3kT}{m}}=\sqrt{\frac{3(1.38\times10^{-23}J/K)(6000K)}{4.0(1.66\times10^{-27}kg)}}\approx6\times10^3m/s$$
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