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The atomic line spectrum of hydrogen contains a line in the near-UV spectrum that corresponds to...

The atomic line spectrum of hydrogen contains a line in the near-UV spectrum that corresponds to an electron transitioning from an n = 7 orbital to an n = 2 orbital. What is the energy of the emitted photons that produce this line?

I know the answer is 5.00 x 10^-19 J, I'm just unsure on how to go about solving it. Please give any equations used and where the numbers come from so I can try other problems on my own. Thank you!

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