Physics · KINETIC THEORY

Natural uranium hexafluoride is a mixture of \( ^{235}\text{UF}_6 \) and \( ^{238}\text{UF}_6 \). Given that the atomic mass of Fluorine is \( 19\text{ u} \), the percentage difference between the average speeds of \( ^{235}\text{UF}_6 \) and \( ^{238}\text{UF}_6 \) at any common temperature is approximately:

1. A
   \( 0.86\% \)
2. B
   \( 0.44\% \)
3. C
   \( 1.28\% \)
4. D
   \( 0.22\% \)