Compare the radii of the nuclei of mass numbers 27 and 64.

Explanation

`A_1`=27, `A_2`=125
The radius of a nucleus , `R=R_0A^(1//3)`
`rArr R prop A^(1//3) rArr R_1/R_2=(A_1/A_2)^(1//3) =(27/125)^(1//3)=3/5`