CHEMISTRY!!! Please help?

  • Thread starter Thread starter Alex B
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Alex B

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Calculate the wavelength in nanometers for the photon emitted when a hydrogen atom undergoes the transition from n = 6 to n = 5.

I know the answer to this question is 7460nm!
This is the question that I cant figure out.....

So how much energy (in Joules) is released when one mol of hydrogen atoms undergoes this transition?
 
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