(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

## \frac 1 2 m<v_x^2> =\frac 1 2 k_BT ,

\\ \sqrt{ <v_x^2>} = 556~ m/s ## So, I guess that the standard deviation should be less than rms speed.

So, the option is (a)

## \left< ax + b \right> = a\left<x\right> + b ##

So, ## \left< v_x^2 - <v_x^2> \right> = \left< v_x^2\right> - \left< v_x^2\right> = 0 ##

Is this correct?

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# Homework Help: Standard deviation of V_x of He gas

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