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Consider aiming a beam of free electrons towards free protons.

Question:

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

Solution:

(a) because of energy conservation

(b) without simultaneously releasing energy in the form of radiation