russ_watters said:Irony relocated to gd: https://www.physicsforums.com/showthread.php?t=458776
Light travels at a finite speed because it is made up of particles called photons, which have a mass of zero. According to Einstein's theory of relativity, objects with zero mass can only travel at the speed of light. This means that light can never travel faster or slower than its current speed.
Light travels at a speed of approximately 299,792,458 meters per second, which is equivalent to about 670,616,629 miles per hour. This is known as the speed of light in a vacuum, as light can travel at slightly slower speeds in different mediums.
Light travels slower in different mediums because it interacts with the particles in the medium. When light enters a medium, it is absorbed and re-emitted by the particles, causing it to slow down. This process happens constantly as light travels through the medium, resulting in an overall slower speed.
No, according to the theory of relativity, light can never travel faster than its current speed. This is because objects with zero mass, like photons, can only travel at the speed of light. However, scientists have been able to manipulate the speed of light by slowing it down or speeding it up in different mediums.
Yes, light always travels at the same speed in a vacuum. However, as mentioned before, the speed of light can be manipulated in different mediums, resulting in a slightly slower or faster speed. Additionally, the speed of light can also be affected by gravity, causing it to bend or curve in its path.