Question

what is the speed of light

Answer 1

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SPEED OF LIGHT IS 3*10^8 m/s...

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Answer 2

The speed of light in vacuum, commonly denoted c, is a universal physical constantimportant in many areas of physics. Its exact value is 299,792,458 metres per second(approximately 300,000 km/s (186,000 mi/s)[Note 3]). It is exact because by international agreement a metre is defined to be the length of the path travelled by light in vacuum during a time interval of 1/299792458 second.[Note 4][3] According to special relativity, c is the maximum speed at which all conventional matter and hence all known forms of information in the universecan travel. Though this speed is most commonly associated with light, it is in fact the speed at which all massless particles and changes of the associated fields travel in vacuum (including electromagnetic radiationand gravitational waves).



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