What Quantum Transition Occurs Inside a Hydrogen Atom to Produce

question 107

Multiple Choice

What quantum transition occurs inside a hydrogen atom to produce a 21-cm radio photon?

• A) An electron falls from the level n = 100 to the level n = 99 in the atom.
• B) An electron in the ground atomic state reverses its direction of spin with respect to that of the proton.
• C) An electron reverses the direction of its motion in orbit around the proton.
• D) The electron combines with the proton in the nucleus to become a neutron, producing energy.

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