Question

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

A
13×106 s
B
13×108 s
C
18×103 s

Solution

## The correct option is B 13×108 sThe 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 ms−1 in vacuum.  We know, speed=distancetime⇒time=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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