The Bohr model of the hydrogen atom
In 2013 we celebrate the 100th anniversary of Bohr's model of the
hydrogen atom in many different ways.
We have prepared teaching
material including experiments and professional information, lectures,
conferences and also this interactive video poster.
On the poster you
will find two QR codes leading to small films about Niels Bohr and also
an animation of the visible part of the Balmer series.
Download the video
The animation is in Danish. The following is a translation
of the speech as well as references to additional information.
The electron moves at levels of constant energy/stationary states around
the atomic nucleus without emitting any energy (light).
The electron never exists between the stationary energy levels.
When energy is provided, e.g. in the form of light (a photon), a precise
amount of energy is absorbed and the electron disappears and reappears
in a higher energy level
The amount of energy absorbed corresponds ONLY to the energy difference
between the two energy levels.
You CANNOT see the electron during the transition between stationary
Notice at the bottom right, a black line appears in the spectrum as an
absorption line. This is the energy the electron takes so energy/light
disappears from the spectrum.
At some time, the electron falls again to the lower energy level. The
difference in energy between the two levels is emitted in the form of a
Notice that an energy/light line appears again in the emission spectrum
at the lower left.
Links in english: