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Yes, a photon moves at the speed of light, because photons have no mass.
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∙ 14y ago
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How photon differ from an inertial particle?
In a vacuum, a photon can ONLY move at the speed of light. A regular particle can ONLY move at speeds less than the speed of light.
Is there anything which can move at a speed of light?
yes, exemple; photon and electricity
Is it possible to attain light speed?
Only if you are a photon. In that case, you always move at the speed of light. If you're not a photon, and have any mass while you're sitting still, and are not moving at the speed of light right now, then you can never attain light speed.
Can fast neutron and photon have same speed?
No, a photon always moves at the speed of light, and nothing with non-zero mass (which includes neutrons) can move that fast
How does photon differ from inertial particle?
A photon is said to be "massless", meaning that it has no REST MASS (of course, having energy, it also has an equivalent mass).In a vacuum, a photon can ONLY move at the so-called speed of light (about 300,000 km/second). "Regular" particles can ONLY move at sub-light speed. They can get close to the speed of light, but never quite reach it.
Is that true that the more energy of a photon the bigger the mass it possesses?
No, all photons have the same mass. Photons are massless (i.e. zero). All the energy in a photon is in its momentum, but increasing its momentum does not change it speed which is always "the speed of light". All massless particles always move at the speed of light.
Why photon has rest mass zero?
That's related to the fact that it moves at the speed of light. If you look at the formula for mass increase as a function of speed, it should be obvious that the mass of anything that has a non-zero (i.e., positive) rest mass would approach infinity as the object approaches the speed of light - meaning that the speed of light itself can never be reached, since that would give the object an infinite mass (and require an infinite energy). The only way an object can move at the speed of light is for it to have a rest mass zero. In a way, this is hypothetical, since particles such as the photon or graviton, that move at the speed of light, can only move at the speed of light.
Where does a photon get its speed from?
Nowhere. A photon must travel at the speed of light so it starts with that speed when it is created. This is the origin of the theory of special relativity.
How long it takes for a particle from the moon to hit earth?
Well, if it is a particle of light (a photon) it takes about a second and a half. If it is any other particle, one that does not move at the speed of light, then you have to define a speed for it.
What is photon characteristics?
Under the photon theory of light, a photon is a discrete bundle (or quantum) of electromagnetic (or light) energy. Photons are always in motion and, in a vacuum, have a constant speed of light to all observers, at the vacuum speed of light (more commonly just called the speed of light) of c = 2.998 x 108 m/s.
What is property of photon?
Among others: mass zero; electric charge zero; stable (it doesn't decay); it can only move at the speed of light.
What travels at light speed besides engines?
Engines cannot travel at light speed. The only thing that can travel at this speed is the Photon, the particle of light.
