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how do we measure speed of light. The speed of light in a vacuum stands at exactly 299792458 metres per second. Its exact value is defined as 299 792 458 metres per second approximately 300 000 kms or 186 000 mis.
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And when an experiment involves lasers its hard to argue with the results. In the 1970s interferometry was used to get the most accurate value for the speed of light that had been measured yet. The first measurement was done in 1849 by Hippolyte Fizeau using a simple but ingenious device.
C 299792458 meters per second.
And when you measure the wavelength and multiply it out by the microwave frequency youll end up with a surprisingly close approximation of the speed of light. The speed of light is 299792458 meters per second. And when you measure the wavelength and multiply it out by the microwave frequency youll end up with a surprisingly close approximation of the speed of light. The reason today we can put an exact figure on it is because the speed of light in a vacuum is a universal constant that has been measured with lasers.
