Chemistry: Calculating frequency between energy levels?

nyk

New member
I have a question I'm having a lot of trouble with. I'm having trouble with calculating frequency between energy levels.

The question I can't seem to get right deals with finding the frequency, in Hz, of the photon that is emitted when an electron goes from n = 7 to n = 2, in a hydrogen atom. please help me on how to do this!
 
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