How do I know if the energy releases or absorbs by calculating the wavelength of the following transition
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How do I know if the energy releases or absorbs by calculating the wavelength of the following transition

[From: ] [author: ] [Date: 12-03-11] [Hit: ]
......
n=3 to n=1

the answer was wavelength = -1.026x10^-7 with "energy released"
Why is it "energy released"?

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I'm assuming it's something to do with the negative sign in front of it. There is no such thing as negative wavelengh.
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