Uploaded October 2012 | Updated September 2026, 3 weeks ago

---

Planck found that to explain the relationship between temperature and radiation he had to assume that radiation energy is transferred in discrete quanta. Einstein pointed out that the so-called photoelectric effect provided convincing evidence that Planck's quanta were real particles, what we now call photons.

The playlist: youtube.com/playlist?list=PL193BC0532FE7B02C

http://www.sps.ch/fileadmin/pictures/Experimente/FromPhotonsToWaves.avi