Do Photons Have Different Rest Mass?

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SUMMARY

Photons are massless particles with zero rest mass, regardless of their frequency or energy. The equation E = pc confirms that while photons possess energy related to their frequency, they do not have rest mass. This distinction between rest mass and inertial mass is crucial in understanding the properties of photons, which always travel at the constant speed of light (c).

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physicsatiztech
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"the mass of photon"

I definitely know that photons don't have any mass if it is moving with it's well-known speed. However, it has its rest mass. So my question is

The energy of photons depend on their frequencies, however the freq. may differ from photon to photon. So I think their rest mass should also differ from photon to photon...

Am I right, or ...?
thanks a lot
 
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Photons are massless--they have zero rest mass.
 
physicsatiztech said:
I definitely know that photons don't have any mass if it is moving with it's well-known speed.
And that speed is always a constant (i.e. has the same value irrespective of the frame of reference) having the value c. The rest mass of any particle which moves with speed = c will have zero rest mass.
The energy of photons depend on their frequencies, however the freq. may differ from photon to photon. So I think their rest mass should also differ from photon to photon...

Am I right, or ...?
thanks a lot
You're not quite right in the sense that you're speaking about two different definitions of mass as if they were one. The value E = pc for a photon means that its rest mass is zero but that its inertial mass is not zero.


Pete
 
I asked this same question many moons ago
MINT!
 

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