$A$ nucleus breaks into two nuclear parts,which have their velocity ratio $2:1$. The ratio of their nuclear radii will be

If the size of a nucleus (in the range of $10^{-15} \; m$ to $10^{-14} \; m$) is scaled up to the tip of a sharp pin,what roughly is the size of an atom (in $; m$)? Assume the tip of the pin to be in the range $10^{-5} \; m$ to $10^{-4} \; m$.

Mass numbers of two nuclei are in the ratio of $4: 3$. Their nuclear densities will be in the ratio of

Highly energetic electrons are bombarded on a target of an element containing $30$ neutrons. The ratio of the radius of the nucleus to that of a Helium nucleus is $14^{1/3}$. The atomic number of the nucleus will be

$A$ particle having almost zero mass and exactly zero charge is

$A$ nucleus represented by the symbol ${ }_{Z}^{ A } X$ has