Question

suppose a particular atom has only two allowable electron orbits. how many different wavelength photons (spectral lines) would result from all electron transitions in this atom?
1. three
2. four
3. None of these
4. one
5. two

please help..
Since a photon results from a transition from one orbit to one of a lower energy, I do not see how more than one transition would be possible with a photon resulting.
1 to 2 £¬1 to 3£¬and 2 to 3

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