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For an isotropic gas, the mean of vx² equals which fraction of the mean square speed <v²>?
AAll of <v²>
BOne half of <v²>
COne third of <v²>
DThree times <v²>
Answer & Solution
Correct answer: C. One third of <v²>
With no preferred direction the three components share <v²> equally, so <vx²> = <v²>/3.
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