Question

kilometre is a unit of length.what is SI unit of length? A) metre B) Millimetre C) centimeter D) nanometre​

Answer 1

Answer:

Hey mate here is your answer

Explanation:

A)Metre

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Answer 2

Option A is correct

metre

Explanation :

• The SI unit of length is the metre, represented by the sign m. It is specified as 299 792 458 when stated in the unit m s-1, with the second defined in terms of vCs.
• The kilogramme is the SI unit of mass and has the symbol kg.

• A tangible item - two markings etched on a platinum-iridium bar - was previously used to define the metre.
• The history of the meter's definition is explained in The Length - Evolution from Measurement Standard to a Fundamental Constant.
• The NIST Length Timeline shows how these changes have occurred over time.