For effective nuclear forces,the distance should be

$A$ reaction between a proton and $_8^{18}O$ that produces $_9^{18}F$ must also liberate:

Two nuclei have their mass numbers in the ratio of $1: 3$. The ratio of their nuclear densities would be

$F_{pp}$, $F_{nn}$, and $F_{np}$ are the nuclear forces between proton-proton, neutron-neutron, and neutron-proton respectively. Then the relation between them is:

Weak nuclear force always operates between

When a $U^{238}$ nucleus,initially at rest,decays by emitting an alpha particle with speed $u$,what will be the recoil velocity of the residual nucleus?