Consider aimimg a beam of free electrons to wards free atoms . When they scatter, an electron and a protons cannot combine be produced a H-atom,

Options

A. because of energy conservation.
B. without simultaneously releasing energy in the from of radiation.
C. because of momentum conservation.
D. because of angular momentum conservation.

Answer

a,b

Explanation

Scattering of electrons is according to energy conservation and for electron to combine with proton to form hydrogen atom, some energy is to be released which becomes binding energy for the atom. Hence, electron and proton both must release energy in the form of radiation simultaneously to get connected as hydrogen atom.