The metre is the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second. This definition fixed the speed of light in vacuum at exactly 299792458 metres per second (≈300 000 km/s).
Read from finger for fast and effective reading read in chunks as you manage 3 to 5 words or more.. pay attention stop for a moment for visualize the chunks..
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