The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of $${}_2^4$$ He is
(Given helium nucleus mass $$ \approx $$ 4.0015 u.)

In which of the following systems will the radius of the first orbit (n = 1) be minimum ?

A nuclear reaction given by

_ZX^A $$ \to $$ _z+1Y^A + _$$-$$1e⁰ + $$\overline v $$ represents

Which of the following are suitable for the fusion process ?