question_answer

If \[{{r}_{1}}\] and \[{{r}_{2}}\] are the radii of the atomic nuclei of mass numbers 64 and 125 respectively then the ratio \[{{r}_{1}}/{{r}_{2}}\] is:

A) \[\frac{64}{125}\]                                 

B) \[\frac{8}{5}\]

C) \[\frac{5}{4}\]                          

D) \[\frac{4}{5}\]