chemistry

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The electron in a hydrogen atom is excited and makes a transition from n=2 to n=7

a. calculate the energy of the photon absorbed in joules.
b. calculate the wavelength of the photon in meters

HOW DO I DO THIS?

  • chemistry -

    1/wavelength = R(1/n1^2 - 1/n2^2)
    R = Rydberg constant. I assume you have that in your text or notes.
    For n1 you substitute 2 and square it.
    For n2 substitute 7 and square it.
    From wavelength, you can calculate energy from E = hc/wavelength.
    (Note:I arranged n1 and n2 so you would get a positive number for wavelength. You must remember that you are going from 2 to 7 which means energy is absorbed.)

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