What is the wavelength of the photon emitted when a hydrogen atom goes from the third energy level to the first energy level?

Answer

To find the length of the wavelength you need to refer back to the basic wavelength diagram that most instructors show you. You most probably do not need to know the exact wavelength but you need to know how to compare them.
Q&A Related to "What is the wavelength of the photon emitted..."
the answer is n=4. first of all, find the energy difference between the two energy levels by computing the energy of the photon. E = hc/L = 6.63x10^34Js x 3x10^8m/s / 4.052x10^6m
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It has been so long, I can only explain it partially. 1) Find out the energy difference between the two levels. I'm not sure how you do this part - look it up the physical values
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