Considering aiming a beam of free electrons towards free protons. When they scatter an electron and a proton cannot 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

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Both ‘b’ and ‘d’ are true

Both ‘c’ and ‘d’ are true

Both ‘a’ and ‘c’ are true

Both ‘a’ and ‘b’ are true

answer is B.

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Detailed Solution

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.

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