Sounds

Multimedia files - sounds

Atomic structure - Bohr model

Electron travels on a circular orbit in a way that de Broglie wave is a standing one - position of arrows are constant.

Like the vibrating wine glass

or a "Chinese" bowl

The bowl can also vibrate making not 4

but 6

arrows on the circle -

it "plays" not its first (fundamental)

but higher harmonics

.
For the hydrogen atom this would be the third orbit.

Obviosly, the bowl is not the best instuments to hear clearly harmonics -

try the first

and second harmonics

of this flute. Try violin

and see its frequency spectrum

How does the laser work?

Very simple! It is just a single tube with gas and two mirrors on ends.

To make it "singing" at a certain frequency (color)
it is just enough to adjust the length of the tube
to the wavelength of the light (i.e. to its multiple).

Exactly the same, as this didgeridoo player [1] does.

Very, very recent lasers, allowing to observe single electron in flight [2]
emmit ultrafast puleses, which are, due to Heisenberg principle, not any more
of well defined color but white. Like "white" is this sound [3]

.
If you don't believe, just watch

this sound!

[1] “Fruits fo the Forest” from “Didgeridoo, Tribal Spirit” by Tjnara Goreng-Goreng, Simon Black plays on didgeridoo, Mazur Media, 2002
[2] J. Itani et al., Tomographic imaging of molecular orbitals, Nature 432 (Dec. 2004) 867
[3] Fryderyk Chopin, Impromptu cis-moll op.posth., plays Rafał Lewandowski, Futurex, 2001