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Define Standard Metre.

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Question

Define Standard metre.

Definition
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Solution

The standard metre is defined in terms of the speed of light, according to which one metre is the distance travelled by light in `1/(299,792,458)` of a second in the air (or vacuum).

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Measurements
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Chapter 1: Measurements and Experimentation - Exercise 1 (A) [Page 9]

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Selina Concise Physics [English] Class 9 ICSE
Chapter 1 Measurements and Experimentation
Exercise 1 (A) | Q 9 | Page 9

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