Uranium Has Two Isotopes U²³⁸ and U²³⁵

question 42

Multiple Choice

Uranium has two isotopes U²³⁸ and U²³⁵.Enriched uranium,with a greater fraction of U²³⁵ required by nuclear reactors,is synthesized by first forming the compound UF₆ in the gaseous form and then allowing it to pass through a porous medium.The two isotopes are then separated by diffusion which depends on the rms speeds of the molecules.Given the mass of a fluorine atom is 19 amu,masses of U²³⁵ and U²³⁸ atoms are 235.043924 amu and 238.050785 amu,respectively,the ratio of the rms speeds of the two uranium hexafluoride molecules is

• A)1.1000.
• B)1.0043.
• C)1.0420.
• D)1.0680.
• E)10.459.

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