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Physics

Define one metre, the S.I. unit of length. State its one multiple and one sub multiple.

Measurements

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Answer

One metre is defined as the distance travelled by light in air in $\dfrac{1}{3\times 10^8}$ of a second.

Multiple : Kilometre (symbol km)

1 km = 1000 m

Submultiple : Centimetre (symbol cm)

1 cm = $\dfrac{1}{100}\ \text {m or}\ 10^{-2}\ \text m$

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