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प्रश्न
Define one metre, the S.I. unit of length. State it's one multiple and one submultiple.
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उत्तर
One metre is defined as the distance travelled by light in the air in `1/(299,792,458)` of a second.
The S. I. unit of length is meter.
Multiple of metre = Kilometre (km).
Submultiple of metre = Centimetre (cm)
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