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Uranium isotopes have been separated by ...

Uranium isotopes have been separated by taking advantage of the different rates of diffusion of the two formsof uranium hexafluoride, one containing U-238 isotope and the other containing U-235. What are the relative rates of diffusion of these two molecules under ideal conditions ?

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A
`(r(overset(238)""UF_(6)))/(r(overset(235)""UF_(6)))=sqrt((M(overset(235)""UF_(6)))/(M(overset(238)""UF_(6))))=sqrt((235+19xx6)/(238+19xx6))=sqrt((349)/(352))=0.9957:1`
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