# Does light travel instantaneously?

## Does light travel instantaneously?

The round-trip speed of light in a vacuum is 186,000 miles per second. It is impossible to measure the one-way speed of light. For all we know, it could be instantaneous.

## What does instantaneous light mean?

n. 1 a very brief time; moment. 2 a particular moment or point in time. at the same instant.

Why is the speed of light not instantaneous?

This speed, which we call “c,” is measured to be 300,000,000 meters per second. That something, the universal conversion factor, is the speed of light. The reason that it is limited is simply the fact that a finite amount of space is equivalent to a finite amount of time.

Are foot candles cumulative?

Footcandles are NOT cumulative per fixture. All other things being kept the same, at a set distance between a fixture and the object being measured, doubling the number of PAR bulbs will double the light, whether you measure it in footcandles or convert it to stops.

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### Is Lightspeed possible?

So will it ever be possible for us to travel at light speed? Based on our current understanding of physics and the limits of the natural world, the answer, sadly, is no. So, light-speed travel and faster-than-light travel are physical impossibilities, especially for anything with mass, such as spacecraft and humans.

### How did Einstein know that the speed of light is constant?

Albert Einstein chose a synchronization convention see Einstein synchronization that made the one-way speed equal to the two-way speed. The constancy of the one-way speed in any given inertial frame is the basis of his special theory of relativity.

Are Tachyons real?

A tachyon (/ˈtækiɒn/) or tachyonic particle is a hypothetical particle that always travels faster than light. Most physicists believe that faster-than-light particles cannot exist because they are not consistent with the known laws of physics. No experimental evidence for the existence of such particles has been found.