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Question

1 metre can be defined as:


A

Distance travelled by light in (1/299792458) s

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B

A rod

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C

Foot of a person

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D

Either of the above

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Solution

The correct option is A

Distance travelled by light in (1/299792458) s


The speed of light is constant throughout the vacuum. Hence it is a suitable standard and can be taken as reference for measurement of distance. The speed of light is 299792458 ms1 in a vacuum.
We know, speed=distancetimetime=distancespeed
Given, distance =1 m
time=1299792458 s
i.e., One meter is the distance travelled by light in 1299792458 s in vacuum.


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