What is the root-mean-square speed of helium atoms (mass (6.646 times 10^{-27} mathrm{~kg}) ) in a star

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What is the root-mean-square speed of helium atoms (mass \(6.646 \times 10^{-27} \mathrm{~kg}\) ) in a star where the temperature is \(1.8 \times 10^{4} \mathrm{~K}\) ?

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