Linkit aukeavat uuteen ikkunaan. 
- teht. 1-9 fotonin energia
- 2-11 valosähk. ilmiö
- 2-13 Comptonin sironta

Phet-demo Black Body Radiation: https://phet.colorado.edu/fi/simulation/legacy/blackbody-spectrum
Photoelectic Effect: https://www.youtube.com/watch?v=v-1zjdUTu0o
Phet-demo Photoelectric Effect: https://phet.colorado.edu/fi/simulation/legacy/photoelectric
Khan Academy Photoeletric Effect: https://www.youtube.com/watch?v=vuGpUFjLaYE
Compton Scattering: https://www.youtube.com/watch?v=oY7EFL4AN9A