Quantum Issues Often Constrain Transitions in Quantum Harmonic Oscillators to Those

Multiple Choice

Quantum issues often constrain transitions in quantum harmonic oscillators to those where $\Delta n=1$ . Consider a spectrum chart (like the one shown in figure Q11.2) for such a system. What would this chart look like?

A) There would be only one emission line.}
B) The emission lines would be evenly spaced in energy.
C) The emission lines would become more closely spaced (in energy) as we go to the right.
D) The emission lines would become farther apart (in energy) as we go to the right.