[填空题]
One means of enrichinrn3(v-ds+q wzt, tci.ge,ov; 4 ya0fmp;vs:ig uranium is by diffusion of the gas $\text{UF}_6$. Calculate the ratio of the speeds of molecules of this gas containing $_{92}^{235}\text{U}$ and $_{92}^{238}\text{U}$ on which this process depends. :1