how speed of light is measured
Answers
Answer:
A method of measuring the speed of light is to measure the time needed for light to travel to a mirror at a known distance and back. ... Knowing the distance between the wheel and the mirror, the number of teeth on the wheel and the rate of rotation, the speed of light can be calculated.
Explanation:
Answer:
The speed of LIGHT is: c=299792458ms−1
And that is absolutely 100% accurate, with no measurement errors. But Jack, I hear you say, what are you talking about? The reason we know that that’s exactly the speed of light, is that we defined it to be that number. We then take our definition of a second (the length of time for a certain number of periods of the radiation emitted in hyperfine transitions in caesium-133), and from that we define a meter. So the thing we would be measuring is what a meter is.
We use the speed of light as a fixed velocity, from which all observers can define their own length scale. To measure the speed of light would require an external definition of what a meter is, and since about the 1970s, we don’t have one.
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