1.

Consider aiming a beam of free electrons towards free protons. When they scatter, an electron and a proton cannot combine to produce a H-atom,

Answer»

because of energy conservation
without simultaneously releasing energy in the FORM of radiation
because of momentum conservation.
because of angular momentum conservation.

Solution :When an electron beam is made incident on free protons, each electron coming successively, experiences an attractive type of resultant Colombian force which KEEPS on changing because of change in distance as well as change in arrangement of the charges. Because of this, the stream of electrons get scattered, so as to conserve energy. In these CIRCUMSTANCES, proton and electron can not come extremely CLOSE to each other and unless they emit energy equal to magnitude of binding energy of H-atom in the form of radiation, they can not form H-atom.
`rArr` Thus, OPTIONS (A) and (B) are correct.


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