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Time travel

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I think its not make sense to measure M-rest of photon. because photon is never existed stationary, so if it zero it could ruin several equation. And since photon behave like wave. Then I can come out with this :

mc^2 = hf => m=hf/c^ 2

Photons do not have mass! Please google the information instead of trying to come up with your explanation for physics thats already been known/solved.
 
W

wahdangun

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Yea, strictly speaking time is the 4th dimension, but it all gets a little confusing when trying to explain an extra spacial dimension over 4. I think we refer to the dimensions in space and in time separately.

Somne guys blog about the 4th dimension, it contains a little explanation but i'm not sure how scientifically accurate it is.
http://meltingpot.fortunecity.com/melwood/368/time3.html

yes its really lack of evidence just speculation. And actually we didn't have any proof yet that spatial 4th dimension exist.
 
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wahdangun

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Photons do not have mass! Please google the information instead of trying to come up with your explanation for physics thats already been known/solved.

so how you define mass-rest if the photon them self always travel @ speed of light? Change it to Zero won't help either.

Maybe I'm not quite clear before, here I will give you more :

E=hf

where h is a constant (Planck's constant) and f the frequency of the photon
(don't forget that the photon
is an electromagnetic WAVE
and has a frequency). If we
combine these two equations,
we come up with the following,which gives us the
mass of a photon

mc^2 = hf
m = hf/c^2

which means that though
photons don't have rest mass,
they do have energy and thus
they have mass. The photons
are wave particles. This means
that they act as waves and as particles as well. This is the
duality of the nature of light
(and of every particles). And
so as particles they have mass,
and as waves they have
frequency. so how about that!
 
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yes its really lack of evidence just speculation. And actually we didn't have any proof yet that spatial 4th dimension exist.

The nasa experiments that have just been completed prove the existence of a 4th dimension and gravity wells.
 
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so how you define mass-rest if the photon them self always travel @ speed of light? Change it to Zero won't help either.

Maybe I'm not quite clear before, here I will give you more :

E=hf

where h is a constant (Planck's constant) and f the frequency of the photon
(don't forget that the photon
is an electromagnetic WAVE
and has a frequency). If we
combine these two equations,
we come up with the following,which gives us the
mass of a photon

mc^2 = hf
m = hf/c^2

which means that though
photons don't have rest mass,
they do have energy and thus
they have mass. The photons
are wave particles. This means
that they act as waves and as particles as well. This is the
duality of the nature of light
(and of every particles). And
so as particles they have mass,
and as waves they have
frequency. so how about that!

http://www.physicsforums.com/showthread.php?t=63579

"Light has no REST mass. However light travels at the speed of light! In the equation E=mc2, m is the rest mass divided by the Lorentz transformation factor, which is 0 for anything going at the speed of light. Therefore the m is now 0/0, so the equation is meaningless for light. Light does have energy using the equation E=hf (f=frequency) and is affected by gravity."

http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/photon_mass.html
 
T

twilyth

Guest
Einstein was wrong about both space and time - neither exists.

http://www.sciencenews.org/view/feature/id/72337/title/Out_of_the_fabric

Today’s leading theories for answering the greatest cosmic questions suggest that neither time nor space appear in reality’s ultimate recipe. Somewhere between the stove and the table, space and time emerge, cooked up out of equations underlying an existence without rulers and clocks. At least that is “the widespread current belief,” says physicist Joe Polchinski of the Kavli Institute for Theoretical Physics at the University of California, Santa Barbara.

And you thought quantum mechanics was bizarre.
 
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wahdangun

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http://www.physicsforums.com/showthread.php?t=63579

"Light has no REST mass. However light travels at the speed of light! In the equation E=mc2, m is the rest mass divided by the Lorentz transformation factor, which is 0 for anything going at the speed of light. Therefore the m is now 0/0, so the equation is meaningless for light. Light does have energy using the equation E=hf (f=frequency) and is affected by gravity."

http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/photon_mass.html

so I ask you where are the flaw in my equation ?

Since we can measure light energy with E=hf. So I doubt my equation is wrong
 

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I'm going to go cry in the shower now. ;)
 
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http://www.physicsforums.com/showthread.php?t=63579

"Light has no REST mass. However light travels at the speed of light! In the equation E=mc2, m is the rest mass divided by the Lorentz transformation factor, which is 0 for anything going at the speed of light. Therefore the m is now 0/0, so the equation is meaningless for light. Light does have energy using the equation E=hf (f=frequency) and is affected by gravity."

http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/photon_mass.html

I'd just like to point out that the equation e=mc^2 is used to find the energy contained in the mass of a particle. As photons have no mass they cannot have any energy in their mass. I.e. you can't break a photon down into smaller particles and get any energy out.
The energy it does have would be synonymous with kinetic energy, although it doesn't have any kinetic energy as such. Light as a wave is a means of energy transfer. All the energy is actually tied up in the EM field (the medium).

so I ask you where are the flaw in my equation ?

Since we can measure light energy with E=hf. So I doubt my equation is wrong

The flaw is you are comparing 2 different energies. in e=mc2 and e=hf they are different types of energy, and as such you can not make hf=mc^2. Although saying that, sometimes people do to come up with m=f
 
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HammerON

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so how you define mass-rest if the photon them self always travel @ speed of light? Change it to Zero won't help either.

Maybe I'm not quite clear before, here I will give you more :

E=hf

where h is a constant (Planck's constant) and f the frequency of the photon
(don't forget that the photon
is an electromagnetic WAVE
and has a frequency). If we
combine these two equations,
we come up with the following,which gives us the
mass of a photon

mc^2 = hf
m = hf/c^2

which means that though
photons don't have rest mass,
they do have energy and thus
they have mass. The photons
are wave particles. This means
that they act as waves and as particles as well. This is the
duality of the nature of light
(and of every particles). And
so as particles they have mass,
and as waves they have
frequency. so how about that!

E=hf is based on old quantum theory.it should not be reconcileD with bleeding edge theories like"SR".:cool:
 
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