Physics Help Please

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2010-04-25 17:09:45

h4hagen: Whats my age again?; +91|6759|Troy, New York

Karma for any help.

Have a test tomorrow afternoon, going through my practice problems and realized I have no idea how to do energy level transitions.
Question is:
Find the wavelength of the third Balmer line of hydrogen. Is it visible (between 4000 and 7000 angstroms).

Similar Question:
Find the wavelength of the EM radiation emitted during the second Lyman transition of Hydrogen.

I think I want to use lambda = hc/ delta e but I have no idea how to do so. I'm familiar with Lyman Balmer and Paschen, but again not how to apply them.

Any help at all would be great.

2010-04-25 20:58:30

Spark: liquid fluoride thorium reactor; +874|7081|Canberra, AUS

formula you want

$https://latex.codecogs.com/gif.latex?\bg_white%20\frac{1}{\lambda}=R_H\left(\frac{1}{n_f^2}-\frac{1}{n_i^2}\right)$

gives you the wavelength of the emitted (or absorbed) photon in transition, you can work out its energy from E = hf. I assume you know how what R_H is, and how to substitute the energy levels for nf, ni.

Last edited by Spark (2010-04-25 21:00:19)

The paradox is only a conflict between reality and your feeling what reality ought to be.
^{~ Richard Feynman}

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