Question

what is the speed of light​

Answer 1

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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 299,792,458 metres per second. 

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Answer 2

ɦεყα ɱαƭε ɦεɾε เร ყσµɾ αɳรωεɾ 
.
.
●speed of light ...
$3 \times {10}^{8}$
m/s