Posted by **Tina** on Monday, March 21, 2011 at 12:08am.

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 -
**DrBob222**, Monday, March 21, 2011 at 12:25am
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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