# tha mass of photon,a topic of both old and new

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#### htam9876

the mass of a photon ,either the static mass is M0 and the released mass is ∞，or the released mass is hγ and the static mass is zero, (the detailed calculation with Special Relativity omitted),but both are meaningless in physics. If photon has no effective mass, how to explain the Campton efffect. what is the mass of a photon?

#### htam9876

M=m0

The answer is : the released photon is in the state of X4 = ∞，and the released mass is equal to the static mass: M = M0= hγ/C²

Chen Li Qiang
April ,2018
from Xinhui Guangdong Province, China

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#### Pmb

PHF Hall of Fame
the mass of a photon ,either the static mass is M0 and the released mass is ∞，or the released mass is hγ and the static mass is zero, (the detailed calculation with Special Relativity omitted),but both are meaningless in physics. If photon has no effective mass, how to explain the Campton efffect. what is the mass of a photon?
The inertial mass of a photon is well defined and very meaningul. It has the value given by he m in

p = mv

Since for a photon v = c and since the energy of a photon is related to its momentum by E = pc we have p = E/c. Substitute these back in and get

E/c = mc

pr

E = mc^2

Solve fpr m to get

m = E/c^2

You're thinking of a potons roper mass, not its inertial aka "relativistic" mass.

Watch this video - http://www.newenglandphysics.org/common_misconceptions/Alan_Guth_01.mp4

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#### htam9876

the key

the key is X4 = ∞, what is the result?

#### HallsofIvy

That equation, if it is true, says that X4 does not exist.

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#### topsquark

Forum Staff
the key is X4 = ∞, what is the result?
It doesn't matter what X4 is. According to SR the only kind of particle that can travel at the speed of light is a massless one. It comes out of the theory very naturally. PMB has given you a derivation of how to find the momentum of such an object, which is all you need for the Compton effect.

-Dan

#### htam9876

widen

the title of this thread widen to be hoton, a topic of both old and new. ?

#### topsquark

Forum Staff
the title of this thread widen to be hoton, a topic of both old and new. ?
Yes, but none of your equations seems to have anything to do with a photon! Your X4 idea seems to be nothing more than a rescaling, which wouldn't predict anything that you say that it does.

-Dan

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#### htam9876

I hope that someone could give the answer that is the same with me .(X4 = ∞，what's the result?)

#### Pmb

PHF Hall of Fame
I hope that someone could give the answer that is the same with me .(X4 = ∞，what's the result?)
A large number of people who are new to physics and has a new idea hopes the same thing. Nobody has ever been right in that respect.

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