None can.
the light speed are very fast so light easily reach on earth
Neither, mass can never reach the speed of light, this question also contridicts the theory of realativity.
You can't travel at the speed of light. It might be possible, in theory, to approach it, but not quite to reach it.
No, according to the theory of relativity, it is impossible for any particle with mass to reach or exceed the speed of light. Accelerators can increase the speed of particles to high fractions of the speed of light, but they cannot exceed it.
No, because the orbital is really just an abraction - the electron isn't racing around the orbital like a racecar, so there isn't a speed. The orbital is a better measure of the electrons potential energy.
An object with mass might approach, but never reach, the speed of light.An object with mass might approach, but never reach, the speed of light.An object with mass might approach, but never reach, the speed of light.An object with mass might approach, but never reach, the speed of light.
It would never reach the speed of light because things with mass can't move at the speed of light. However, it would eventually get as close to the speed of light as you want.
No such thing would happen. Matter cannot reach the speed of light, only massless things can (and they cannot travel at any other speed than the speed of light).
1.27 seconds
Since no object with mass can reach the speed of light -- such an object can only approach that speed -- the question is meaningless.
from a purely mathematical stand point, if something were to reach the speed of light the time dialation/length contraction formula would yield something over 0. This is beacuse the formula is: constant/[(1-(velocity/speed of light)^2] as you can see, if velocity=speed of light, you get something over zero.
It is not possible for a particle with mass to reach the speed of light, as it would require infinite energy. Additionally, at speeds approaching the speed of light, relativistic effects become significant, causing time dilation and length contraction.