Question

Why the 2 way speed of light in vacuum is 299,772,458m/s exactly? Also tell how to calculate 1 way speed of light?

Answer 1

Yes light travels faster in vacuum than any other medium. This is because there is no obstruction in vacuum for the propagation of light and thus, the refractive index of vacuum is the lowest. ... Light can travel faster in vaccum than in any other medium because there is no obstruction for the passage of light.

The one-way speed

To measure the time that the light has taken to travel from one place to another it is necessary to know the start and finish times as measured on the same time scale.

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Answer 2

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• The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.

• Its exact value is defined as 299792458 metres per second (approximately 300000 km/s, or 186000 mi/s

• It is exact because, by international agreement, a metre is defined as the length of the path travelled by light in vacuum during a time interval of ​1⁄299792458 second

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• No, seriously, we don't measure the speed of light (which always refers to the speed in a vacuum). We know exactly what the speed of light is.

• It is: c=299792458ms−1

• 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.

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