>hurr wtf is plancks constant
>durr energy-momentum relation *licks forehead*
you cataclysmic spastic
Photons are massless, yet have momentum
Elijah Rodriguez
Chase James
The waves in a medium is actually a 3 body problem. The wanes propagate through collisions of particles in the medium.
Light in a vacuum doesn't use a medium.
If you apply conservation of energy and momentum you find it doesn't work for 2 body problems at all.
See photoelectric effect and Compton scattering as examples.
Robert Wood
isn't momentum just "where the energy is going to" and "in what quantity"?
Oliver Gomez
Classically, momentum is
.5mv^2
Since photons are massless, it would have 0 momentum
Jordan Russell
>classically
>photons
Juan Campbell
actually, that's kinetic energy. Classically, momentum is just mv. You could also just define this as the derivative of the kinetic energy with respect to the velocity (this is also true in relativity). For light, dv=0 so dK/dv is undefined. And thus the momentum is not 0 but actually closer to "undefined".
Hudson Campbell
>what r phonons?
Camden Baker
There are different definitions for momentum.
Light would have no 'classical' momentum.
en.wikipedia.org
Colton Bennett
black holes are infinite density. that would require infinite mass, wtf?
Nathaniel Wood
You're a moron.