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## Homework Statement

If an atom in energy level 1, how many absorption spectral lines can an atom exhibit due to transition between 3 levels? How about 4 and 5 levels? And also in emission?

## Homework Equations

Concept

## The Attempt at a Solution

I am confused one book says it can absorb a photon to the third level at once, or to n=2, so there is only 2 possible transitions. Another book says it can absorb once to n=3, n=2, and from n=2 to n=3, so there are 3 possible transitions in total. How am I supposed to count the possible transitions? Here’s a question I encountered, but I need to know how to solve any problems of this kind. Any help is appreciated, Thanks in advance!