The two isotopes of uranium, 235U and 238 U (the superscripts refer to their atomic mass), can

Question:

The two isotopes of uranium, 235U and 238 U (the superscripts refer to their atomic mass), can be separated by a gas-diffusion process by combining them with flouring to make the gaseous compound UF6. Calculate the ratio of the rms speeds of these molecules for the two isotopes, at constant T.