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Question

1 metre can be defined as the distance travelled by light in  in vacuum.


A
13×106 s
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B
13×108 s
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C
18×103 s
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Solution

The correct option is B 13×108 s
The speed of light is constant in the vacuum. Hence, it is a suitable standard and can be taken as reference for measurement of distance. The speed of light is 3×108 ms1 in vacuum. 
We know, speed=distancetimetime=distancespeed
Given, distance =1 m
time=13×108 s
i.e., One meter is the distance  travelled by light in 13×108 s in vacuum.

Physics

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