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wavelengths

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KeLlI:
the line spectrum of litjium has a red line at 670.8nm. calculate the energy of a photon with this wavelength.please explain how to do this problem. i have no idea how to do it!

ssssss:
Use the Planck equation of electromagnetic waves.
E=hv.Energy is in J/photon.

Please refer your book before asking the direct questions.

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