question_answer 25)

  Consider aiming a beam of free electrons towards free protons. When they scatter, an electron and a proton can not combine to produce a H-atom, (a) because of energy conservation (b) without simultaneously releasing energy in the form of radiation (c) because of momentum conservation (d) because of angular momentum conservation

Answer:

  When a beam of free electrons is aimed towards free protons, the electrons get scattered on account of energy conservation. An electron and a proton can combine to produce a H-atom only if they simultaneously release energy in the form of radiation. Choices (fl) and (b) are correct