Which of the following isotopes is normally fissionable ?
$_{92}{U^{238}}$
$_{93}N{p^{239}}$
$_{92}{U^{235}}$
$_{2}{He^{4}}$
Radius of $_2H{e^4}$ nucleus is $3 \,Fermi.$ The radius of $_{82}P{b^{206}}$ nucleus will be..........$fermi$
Which of the following particle has similar mass to electron
Write the formula for the average radius of nucleus.
A nucleus represented by the symbol ${ }_{Z}^{ A } X$ has
What kind of a force does neutron-neutron ?