What Quantum Transition Occurs Inside a Cool Hydrogen Atom to Produce

question 45

Multiple Choice

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

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

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