- #1
Aaron121
- 15
- 1
In A.P. French's Special relativity the author said,
The mass and length of the box are irrelevant here.
He said the momentum of the radiation is ##E_{radiation}/c##. We know that the momentum of a single photon with energy ##E_{photon}## is ##p_{photon}=E_{photon}/c##.
So is ##E_{radiation}## the sum of the energy of each photon, ##E_{photon}##?
We suppose that an amount ##E## of radiant energy (a burst of photons) is emitted from one end of a box of mass ##M## and length ##L## that is isolated from its surroundings and is initially stationary. The radiation carries momentum ##E/c##.
The mass and length of the box are irrelevant here.
He said the momentum of the radiation is ##E_{radiation}/c##. We know that the momentum of a single photon with energy ##E_{photon}## is ##p_{photon}=E_{photon}/c##.
So is ##E_{radiation}## the sum of the energy of each photon, ##E_{photon}##?