A heavy nucleus at rest breaks into two fragments which fly off with velocities in the ratio $8 : 1$. The ratio of radii of the fragments is
$1 : 2 $
$1 : 4$
$4 : 1 $
$2:1$
How is an atom represented ? Why?
If the nucleus ${}_{13}^{27}Al$ has a nuclear radius of about $3.6\,\, fm,$ then ${ }_{32}^{125} Te$ would have its radius approximately as .......$fm$
Isotopes are atoms having
Describe the nuclear force and its characteristics.
A reaction between a proton and $_8{O^{18}}$ that produces $_9{F^{18}}$ must also liberate