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Simple Answer:
Photons are never at rest. It is a fundamental property of the photon that it moves always at the speed of light.
Complex Answer:
Only in a vacuum can we say that light travels at the universal speed, c; the speed of light.
Of course, "the speed of light" is slower for a light moving inside of matter. Indeed, the simplest form of this is demonstrated with light passing through glass where refraction occurs and the speed drops to v=c/n, where v is the speed of light in matter, c is the speed of light in vacuum and n is the index of refraction of the material.
In recent years, it has been demonstrated that under versy special circumstances, light from a laser may be slowed to a few meters per second. That is extreme, but the circumstances constructed to achieve such a phenomena are also extreme.
Some people would say that when a photon passes through matter, it ceases to become one photon and is immersed in a sea of photons that constitute the electromagnetic interactions in that matter. Most people will not invoke this issues when discussing light in matter, but if one wants to stay entirely in the language of photons, the sea of photons has to be incorporated.
With all that said, the answer remains that there are no ways known to make a photon exist in a state of rest.
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∙ 10y ago
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What is length of photon?
Photon do not exist in reality. Newton's Corpuscular Theory of light ASSUMES an imaginary particle PHOTON to explain various phenomena of light.
What is the fastest thing that doesn' exist?
a photon when it is entangled
What is the plot mass of photon?
the photon has got 0 rest mass .and plot mass means? not knowing..
Why is the energy of a photon greater than that of an electron?
It does not. A photon has no rest mass an electron has mass and therefore more energy
What subatomic particles have a mass of 0?
The photon. This refers to the "rest mass"; since the photon has energy, it also has an associated mass. But the "rest mass" or "invariant mass" is zero.
Why the rest mass of photon is zero in quantum mechanic?
I have a theory gw+l=gw l=m. If a gravitational warp traps photon then photon have mass. A small amount 0.000000000000000000000000001 mg. That is what i think. ============================================= Until such time as the previous contributor's hunch can be tested in the laboratory, all theory and experiment so far has shown the rest mass of the photon to be zero.
What is the mass of a photon in motion?
A photon is a massless particle, meaning it has no rest mass. Its mass is zero, but it does have energy and momentum.
What is the difference between a photon and an electron?
charge mass, Whether or not two can exist at the same place.
What is the speed of photon at rest?
Speed = 0 The definition of "rest" is zero velocity in the observer's frame of reference. However, it's important to point out that photons don't do "at rest."
How can particles exist without mass?
People are sometimes confused by the assertion that photons, neutrinos, or other particles have a rest mass of zero. These particles are never at rest, so their rest mass is a purely theoretical concept. All particles have mass, there are no exceptions. It can be a very small amount of mass, as is the case for a photon, but there is some mass. A photon can also be described as being composed of energy, but remember that there is a mass-energy equivalence, as described by Einstein's famous equation, e=mc2. If a particle has energy, it therefore also has some amount of mass.
What do you call a particle of light with zero mass which carries a quantum of energy?
I call it a 'photon'.By the way, the photon has zero rest mass, but when it travels at the speed of light ...which it always does ... it has some mass.
Do photon have a greater energy than electron?
No. A photon has no rest mass an electron has mass.
