The interplanar distance in a crystal is 2.8 $$ \times $$ 10^$$-$$8 m. The value of maximum wavelength which can be diffracted

M_n and M_p represent the mass of neutron and proton respectively. An element having mass M has N neutrons and Z protons, then the correct relation will be

The energy of hydrogen atom in n^th orbit is E_n then the energy in n^th orbit of singly ionised helium atom will be

Energy released in nuclear fission is due to