The difference in energy levels of $n=2$ and $n=1$ of a particle-in-a one dimensional box is 6 units of energy. In the same units, what is the difference in energy levels of $n=3$ and $n=2$ for the above system?
(a)4
(b)5
(c)9
(d)10
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.