Radioactive decay and half-life
Many nuclei decay at random and a Geiger counter clicks. Even so, after each half-life almost exactly half are left.
PhysicsGrade 9–13 · University
Atomic, nuclear and quantum physics
Radioactive decay, spectral lines and the photoelectric effect – experience randomness and quantisation.
Link to the German educational standards (KMK)
- SSubject knowledge
- EScientific inquiry
- BKChance and determinism
- BKStructure of matter
Radioactivity
Grade 9–12Quantum physics
Grade 12–13 · University
Photoelectric effect
Red light can be as bright as you like, it frees not a single electron. Short-wave light does it at once. A puzzle for waves, not for photons.
Atomic models and line spectra
Every element glows in its own colours. When an electron drops one level, exactly one line appears in the spectrum.
Electron diffraction
Electrons hit a thin layer of graphite and form rings on the screen, just like waves do.