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प्रश्न
Define one metre, the S.I. unit of length. State it's one multiple and one submultiple.
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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