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The speed of light in a vacuum is constant, it's value is c.
However c changes with different mediums (air, water...etc). It depends on the index of refraction, n. For example, here is how you would calculate the speed of light in air:
vair= c/nair
In other words, the speed of light changes depending on the medium that it travels through.
What else can I help you with?
How long does it take light to travel in 1 hour?
It takes light exactly one hour to travel in 1 hour.
How fast did Greek chariots go?
They travel to the speed of light? to it? and where exactly is the speed of light?
How far does light travel in a centimeter?
Almost exactly 0.3937 inch .
When does light travel in straight line?
no it does not
Is it possibie to travel at the speed of light?
Nothing with a rest mass can travel at exactly the speed of light, it would take an infinite amount of energy. Light can travel at that speed because it has zero rest mass. Earlier Answer below So far, we don't know if a human can travel at lightspeed. However, it's easier to travel at the speed of light than to travel through time. New Answer: The problem I always had with the term light speed is that speed is relative. We may be traveling close to the speed of light right now in relation to some other object in the universe.
Does light always travel in straight lines?
yes
How fast does the speed of light travel in a vacuum?
Exactly 299,792.548 meters per second.
Does light always travel at the same speed in all mediums?
No, light does not always travel at the same speed in all mediums. Its speed can vary depending on the medium it is passing through.
At what speed do light waves travel?
The speed of light in a vacuum has been defined as exactly 299,792,458 meters per second.
How does light travel through AVACUUM?
Light waves do not need a medium to propagate. Sound waves cannot travel without a medium. Light waves always travel at the speed of light that is 3*108m/s.
When is the only time that light waves travel at the speed of light(186272 miles per second)?
Light waves always travel at the speed of light in a vacuum, regardless of the observer's frame of reference.
Why Don't all electromagnetic waves always travel at the speed of light?
But they do !
