There are many interactive web pages on various quantum mechanical problems
on the web
Many did not work (for me)
I have selected a few which worked for me and that I found easy to use and instructive
Particle in 1D box
(from the University of St.Andrews in Scotland)
-- Click on the energy levels and look at the wave functions and the densities
-- Change the length of the box L0
-- Answer the 'Challenges' (right box on top) (some questions are a bit weird)
Harmonic oscillator
classical, free, damped, forced ...
quantum
(select Setup Harmonic Oscillator, Mouse: Set Eigenstates and point the mouse on the energy levels)
(this applet can also be used for other quantum problems like the particle in the box, called here infinite well)
Hydrogen atom
-- study only n=1 and n=2 (l=0 and l=1 if you want)
Many other applets
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updated 26.11.20 08.30h