Do all photons travel at the same speed?

Question

Do all photons from the same light source travel at the same speed i.e. at the speed of light?

Answer 1

In modern physics, the photon is the elementary particle responsible for electromagnetic phenomena. It mediates electromagnetic interactions and makes up all forms of light. The photon has zero invariant mass and travels at the constant speed c, the speed of light in empty space. However, in the presence of matter, a photon can be absorbed, transferring energy and momentum proportional to its frequency. Like all quanta, the photon has both wave and particle properties, exhibiting wave–particle duality.

The modern concept of the photon was developed gradually (1905–17) by Albert Einstein[3][4][5][6] to explain experimental observations that did not fit the classical wave model of light. In particular, the photon model accounted for the frequency dependence of light's energy, and explained the ability of matter and radiation to be in thermal equilibrium. Other physicists sought to explain these anomalous observations by semiclassical models, in which light is still described by Maxwell's equations but the material objects that emit and absorb light are quantized. Although these semiclassical models contributed to the development of quantum mechanics, further experiments proved Einstein's hypothesis that light itself is quantized; the quanta of light are photons.

The photon concept has led to momentous advances in experimental and theoretical physics, such as lasers, Bose–Einstein condensation, quantum field theory, and the probabilistic interpretation of quantum mechanics. According to the Standard Model of particle physics, photons are responsible for producing all electric and magnetic fields, and are themselves the product of requiring that physical laws have a certain symmetry at every point in spacetime. The intrinsic properties of photons — such as charge, mass and spin — are determined by the properties of this gauge symmetry. Photons have many applications in technology such as photochemistry, high-resolution microscopy, and measurements of molecular distances. Recently, photons have been studied as elements of quantum computers and for sophisticated applications in optical communication

Answer 2

All photons travel at the speed of light. Always.

You'll sometimes hear about the speed of light changing inside a material, but that's not actually true - the speed of light is always the same, it's just the rate at which photons are absorbed and reemitted that changes.

Answer 3

Yes they do, under normal circumstances. Photons can actually be accelerated beyond the speed of light, at which time they "go back in time", something which can only occur for particles of zero mass, like a photon. And there are certain physics experiments where they can slow down photons by passing them through certain media, but these are extreme, non-naturally occurring circumstances.

Answer 4

Usually they do, but last week scientists from Harvard University published a report that they were able to make photons slow down to 20 km/hour and change to matter though a special deep chilled condensate and then back again to speed of light in an experiment that will eventually allow pc's to use atom size components.

Answer 5

nonethless the crompton effect establishes that photons and free electrons collid exactly in such a way that the angle of the scattered electrons [experimentally measurabe] and the shift and the wave length of light [experimentally measurable] obey the conservation pf the law pf momentum and energy. the result is all the photons travel
exactly at the same speed [in a vacuum] "the peed of light", and this speed is independent of the wave length of the incident of photon.

Answer 6

yes , the collection of photon make the wave, if the speed of photon changes then the speed of light also changes which is not noticed . so, speed of all photon is same.

Answer 7

gentle is an electromagnetic radiation, and theoritically no fabric merchandise can return and forth at a velocity better than that of sunshine. Electrons or the different particle travels at a velocity reckoning on how they're produced and /or acclerated. Electrons being comparitively lighter can actually be acelerated rather much to the cost of sunshine.

Answer 8

Yes

Answer 9

In a vaccum they do.

In a medium they may not - some media (which are termed dispersive) have a speed of light that depends on frequency.

Answer 10

No....the red photon of a white light travels at a faster speed than a violet one because of frequency & wavelength.
And please ..don't ask too many questions. They will affect your points.