# Homework Help: Wavelength limits of the Lyman and Paschen series of Hydrogen

1. Oct 11, 2009

1. The problem statement, all variables and given/known data

Use the Bohr theory to find the series wavelength limits of the Lyman and Paschen series of hydrogen.

2. Relevant equations

$$\lambda$$=$$\lambda$$limit(n2)/(n2-n02)

Lyman: n0=1
Paschen: n0=3

3. The attempt at a solution

The solutions are 91.13 nm (Lyman) and 820.1 nm (Paschen) but I do not know the process of finding them.

Thanks for any help.

2. Oct 12, 2009

### gabbagabbahey

There's another equation relating the wavelength of an emitted photon to the quantum numbers $n$ and $n_0$...use that equation and take the limit as $n\to\infty$ (why does this provide the limiting value of $\lambda$? )

3. Oct 13, 2009