from where the light photons get energy to move at such a high speed?do they keep on moving forever?
In: Physics
Photons do not move fast because they have a high amount of energy. They move fast because they do not interact with something called the “higgs field”.
The higgs field is a field that fills the universe and is what gives particles rest mass. Particles that interact with the higgs field, such as electrons and quarks(quarks make up protons and neutrons), are slowed down as they interact with it. Therefor they require energy to accelerate them.
The photon has no rest mass because it does not interact with the higgs field. Therefor, it requires no energy to accelerate it.
To answer your second question, EVERYTHING moves forever unitl it interacts with something. A photon, a marble, or a planet will all move through the universe forever, at a constant speed, until something alters it.
You do not need energy to keep moving if you are already moving and are not affected by friction, resistance etc. You need energy to gain speed, that is, to accelerate, the more mass you have, the more energy you need. Photons do not have a rest mass. This is why they do not need energy to move at all and move forever.
Electromagnetic waves travel at the speed of light. But sometimes electromagnetic waves also behave like particles (Called particle-wave duality) and are modeled as such. The name, they gave these particles, was photon.
Since the photons are electromagnetic waves, they will travel at the speed of light.
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