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/sci/ - Science & Math

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1159915 No.1159915 [Reply] [Original]

photons don't have mass.
photons have momentum.
momentum is defined as mass*velocity.

....ahhhhh, what? My physics book???????? wtf

>> No.1159918

well 0*x = 0

there are no protons. only god.
QED

>> No.1159945

fuckin' magnets

>> No.1159953

>>1159915
They have mass at rest, which allows them to have a momentum.

>> No.1159954

>photons don't have mass
How many photons can fit on tip of a pin?

>> No.1159955

Then i suppose we better focus on their location rather then their momentum huh?

>> No.1159958

no they don't

>> No.1159960

>>1159953
They are always moveing at the speed of light.

>> No.1159965

lrn2einstien
they have relativistic mass
we can all agree that light has energy, thats how lights heat shit up, and solar panels get energy. e=mc^2. So if they have energy, they have mass at least while at rest.

>> No.1159968

>>1159955

troll

>> No.1159971

>>1159965

dude E=mc² stands for the energy to keep atoms together. Shut up

>> No.1159980

>>1159965
But e=mc^2 isn't the full potential equation

>> No.1159988

>>1159971
>>1159980
wait whats that? a bunch of bitch niggers?

http://en.wikipedia.org/wiki/Mass_in_special_relativity#Later_relativistic_concepts

>> No.1159998

>>1159988
Yeah, so like I said that has nothing to do with "at rest"

>> No.1160005

>>1159960
Yeah, but calculations and observation show they have momentum, which means mass.

>> No.1160016

Well... sort of. Light is weird like that.

I haven't heard the term "wavicle" (wave + particle) used to describe them in a while, why has that fallen out of favor? Is it disproved somehow?

>> No.1160030

>>1160016
Pretty much, we don't really describe it in that either/or way anymore

>> No.1160057

photons do not have a mass at rest, or they could never reach speed of light

>> No.1160067

>>1160057

So what exactly do they consist of?

>> No.1160079

>>1160057
Explain why they are slowed down when passing through fibre optic cable then. If they didn't have mass then they wouldn't slow down.

>> No.1160092

>>1159953
0 momentum

>> No.1160099
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1160099

Photons have mass? I didn't even know they were Catholic!

>> No.1160111

The thing that made me understand this idea of momentum is to calculate the pressure made by a EM wave on a metal (magnetic field => intensity on the surface of the metal => Laplace force). Then you "switch back" to a particle and you show that this pressure is equal to the one made by a photon with a momentum.

>> No.1160121

>>1160099
Wow, I've definitely never heard that one before. What a clever joke.