### Atomic Spectra- Question 1.15

Posted:

**Thu Oct 06, 2016 3:55 pm**When solving this problem, I ran into a problem when trying to determine which n value should be used for E(final) and which should be solved for E(initial).

When I plugged in n=1 for E(final) and solved for n, I came up with a decimal energy level, which is not possible.

When I plugged in n=1 for E(initial), I got n=3, which is the correct answer.

Why do I need to plug in n=1 for E(initial) and not E(final) to obtain the correct answer to this question?

When I plugged in n=1 for E(final) and solved for n, I came up with a decimal energy level, which is not possible.

When I plugged in n=1 for E(initial), I got n=3, which is the correct answer.

Why do I need to plug in n=1 for E(initial) and not E(final) to obtain the correct answer to this question?