Electrons are able to travel close to speed of light.
When the light is traveling through vacuum.
Speed. All photons traveling through a vacuum travel at the speed of light.
ANY light traveling through the same medium (stuff) has the same speed.
Nobody knows for sure. We have never witnessed a physical object traveling faster than the speed of light.
Time required to do what? To move from one place to another, divide the distance by the speed of light.
The speed of light is determined by the electric and magnetic properties of the stuff it's traveling through. The "light" itself is just electrostatic and magnetic fields traveling together through the stuff. Change the electrical properties of the medium, and you change the speed of light through it.
It is travelling at a constant speed. This does not mean that there is no acceleration or that the direction of motion remains the same.
is a constant, about 300,000,000 m/s.
Speed is the rate at which an object moves, measured in distance traveled per unit of time. The speed of an object can vary greatly depending on its acceleration, direction, and the medium through which it is traveling. In a vacuum, light travels at a constant speed of approximately 299,792 kilometers per second.
It is travelling at a constant speed. This does not mean that there is no acceleration or that the direction of motion remains the same.
The non-dimensional property that is 1 at the speed of sound is the Mach number. It is the ratio of an object's speed to the speed of sound in the medium it is traveling through. A Mach number of 1 means the object is traveling at the speed of sound.
The speed of light is the result of the electrostatic and magnetic properties of the medium through which it's traveling. The speed changes only when those properties change.