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:
“The secret of a leader lies in the tests he has faced over the whole course of his life and the habit of action he develops in meeting those tests.”
—Gail Sheehy (b. 1937)
“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)