In Progress
Lesson 14, Topic 2
In Progress

# Hydrogen Spectrum

Lesson Progress
0% Complete

Swiss school teacher Johann J. Balmer created a formula which correctly predicted the wavelengths for four visible emission lines of hydrogen.

## Rydberg’s Equation

Swedish physicist Johannes Rydberg created a generalised version of Balmer’s formula to predict all of the hydrogen emission series.

\frac{1}{\lambda}=R\Big [\frac{1}{n_f^2}-\frac{1}{n_i^2}\Big ]

### Conservation of Energy

If an electron moves from one stable orbit ni to a lower stable orbit nf, it must emit the energy difference as a photon. In the same way, an electron may only move up an energy level by absorbing the energy, i.e. from a photon.