2 ms·

You can't use classical physics to calculate the momentum of a photon. https://en.wikipedia.org/wiki/Photon#Relativistic_energy_and_momentum https://en.wikiped

• floxy 3y ago
  Classical electromagnetic waves from Maxwell's equations (i.e. non-quantized) also carry momentum, right? https://www.youtube.com/watch?v=bvzr2HbbPC8 https://www.youtube.com/watch?v=bvzr2HbbPC8 (Maxwell's equations are consistent with relativity) ...or another way of looking at it (that I presume Boltzmann would agree with). If your had a single black body mass at some temperature greater than absolute zero in an otherwise empty universe, it would radiate away heat and thus cool off. The cooler body means the individual atoms in the mass have less energy and less momentum. If momentum is conserved, then that momentum must have been carried away from the mass in the mass-less radiation. Another neat thing is that light can also have angular momentum.