Other Tests
- QED predicts that the photon is a massless particle. A variety of highly sensitive tests have proven that the photon mass is either zero, or else extraordinarily small. One type of these tests, for example, work by checking Coulomb's law at high accuracy, as Coulomb's law would be modified if the photon mass were nonzero. See the article Photon#Experimental checks on photon mass.
- QED predicts that when electrons get very close to each other, they behave as if they had a higher electric charge, due to vacuum polarization. This prediction was experimentally verified in 1997 using the TRISTAN particle accelerator in Japan.
Read more about this topic: Precision Tests Of QED
Famous quotes containing the word tests:
“Although she feeds me bread of bitterness,
And sinks into my throat her tiger’s tooth,
Stealing my breath of life, I will confess
I love this cultured hell that tests my youth!”
—Claude McKay (1889–1948)
“Letters have to pass two tests before they can be classed as good: they must express the personality both of the writer and of the recipient.”
—E.M. (Edward Morgan)