Photons are massless, yet have momentum

Photons are massless, yet have momentum.
Try to wrap your head around that.

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en.wikipedia.org/wiki/Four-momentum
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Planck's constant is a meme

Sound waves are massless, yet have momentum. The fuck is your point?

>Sound waves are massless
classic amerifat

Bruh, no rest mass b/c no rest frame. Plenty of energy, AKA mass tho. Lrn2Equivalence Principle

Perfect example why European universities are ranked so low

Why? Why would you bump this shitty thread 12 hours after the last post? Kill yourself.

Sound waves need a medium to go through photons do not

excitations dont exist without fields.

Light definitely has energy. We can measure it.

Blackbody analysis requires the existence of the photon.

Relativistic energy is

E = sqrt ((mc^2)^2 + (pc)^2)

Since photons are massless, E = pc

Therfore light has momentum.

Don't attach any more significance to it beyond the math and the properties of the photon.

>american education

>Sound waves are massless
Where the fuck did you get this information?

>tfw Michelson and Morley were actually right and light travells through a medium

Photons do need aether :)

except they have a little bit of mass

Think about that for a second...

>Photons are massless

Incorrect. It is merely immeasurable using current technology.

why is it considered wave and particle? how does one reach that concussion or how do they do it?

im a brainlet

underrated

What's up with the fags dissing this? His point is that photons are waves that is why they have momentum. Which is correct. Are you fags from India or something?

Put two slits on a paper and put a laser behind them. The pattern you get means light is a wave. Open your microwave and bake something. Your microwave can only make sense in our universe only if light is particles as well.

>massless
it's probably dark mass or something

He heard it.

That is a question of gravity, user, onto which we cannot shed light.

What. The fuck. Is in that pic?

Look like some kind of strange mollusc

I thought it was an extreme example of oral cancer.

part of a milk bioreactor

Why? Wouldn't EM waves be able to transmit energy regardless of wave-particle duality? How do sound waves transmit energy through a medium?

it's not the sound itself that has the mass you retard, it's the medium it's traveling through. you think sound is an object?
>autism alert

>hurr wtf is plancks constant
>durr energy-momentum relation *licks forehead*
you cataclysmic spastic

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.

isn't momentum just "where the energy is going to" and "in what quantity"?

Classically, momentum is
.5mv^2
Since photons are massless, it would have 0 momentum

>classically
>photons

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".

>what r phonons?

There are different definitions for momentum.
Light would have no 'classical' momentum.
en.wikipedia.org/wiki/Four-momentum

black holes are infinite density. that would require infinite mass, wtf?

You're a moron.

Mass is such an outdated concept, I wish it'd fuck off already.

so what concept whould you use to replace it?

Weight.

Not if they're infinitely small.

if theyre infinitely small then they dont exist

It's a singularity.

its free real estate

underrated

They bend spacetime too. How do you explain that?