Question: 6 marks ] ( a ) He + ions are excited to the n = 4 state. These ions decay to lower energy states by

6 marks](a) He+ ions are excited to the n =4 state. These ions decay to lower energy states by
one or more transitions, emitting light in the process. How many emission bands will be
observed?
(b) Identify from part (a) the transition that will produce the second most energetic photons

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