What is the rest mass of photon when not moving and when moving @99%speed of light?

Question

light made up of aditional substance beside photons.

At what speed do they travel in the medium of glass or water= less than 100% of the speed od light?maybe 99.99999999%?

does relativitic mass apply also to fotons.

Speed of light does not change in a medium?

does foton have lenght during its travel?

Answer 1

C is the common symbol for the speed of light. The speed of light can vary due to what it is traveling through; Vacuum, air, water, glass, and so on. Modern Physics is in upheaval over multiple concepts. Most scientists would go with a popular answer of the rest mass of a photon being zero. However there is debate mentioned above, concerning String, Quantum, and Relativity. There is what is called a dual nature of light; whereby it is called a particle in one statement and a wave in another. This is due to an elementary error and therefore all data that flows from this is questionable, including zero rest mass of the photon. There is a book called "Not even Wrong" that describes the mess physics is in due to string theory.There is also a paper describing the Optical Magnus Effect, that helps in a small way to better understand the behavior of photons.In some of my own studies of light travel in a vacuum I have come upon a very strange potential revelation that indicates that while we measure light to travel at a certain speed, and it covers the distance that would be indicated by that speed, the individual photons are actually moving slightly faster than the speed which we seem to observe, this might actually help explain why there is such difference in reported observations. In other words not unlike a person in a car that travels at 55mph and is constantly changing lanes, thereby covering more distance, ends up at his destination and if the time traveled is divided it seems he was only going 53 mph. The only difference is his erratic motion while constrained by the boundaries of the highway.

Answer 2

Photon is a particle of energy. It always moves with a constant speed 3x10^8 m/s.

Only mass particles have rest mass, that is mass when their speed is zero.
This mass is the internal energy.
When they move with a speed v, the mass increases to say ‘m’.

The kinetic energy of the mass is (increase in mass) times C^2.
Thus a moving mass possess both internal energy and kinetic energy.

The internal energy is rest mass times C ^2; whereas its kinetic energy is increase in mass times C ^2.

But a photon possesses only kinetic energy of motion and has no internal energy. Its internal energy is zero. We say that the rest mass of photon is zero; Strictly speaking it is not correct. One has to understand it as, “It has no internal energy”.

Similarly the speed of photon cannot be reduced; when it interacts with material medium its speed is reduced; but at the same time when it emerges out of a material medium and enters free space its speed again attains the value C.

Therefore in a broader sense, one has to think that the speed of photon is never reduced.

In interaction with matter one has to think that photons are absorbed and re emitted. Hence there is delay.

In matter there is free space between electrons and protons of atoms; in these free spaces photons travel only with the speed C.

Therefore photons cannot be expected to behave exactly like material particles.

Answer 3

This question really doesn't make any sense. Photons are light, and since the speed of light is immutable they can't really travel at 99% of themselves. Also, and more importantly, photons are massless particles by definition and so your question about their "rest mass" is meaningless.