1 metre can be defined as: Options: A . &nbspDistance travelled by light in 1299792458 s in vacuum. B . &nbspDistance travelled by light in 1439898458 s in vacuum. C . &nbspDistance travelled by light in 1399792458 s in vacuum. D . &nbspDistance travelled by light in 1254792458 s in vacuum.

1 metre can be defined as:

Question

1 metre can be defined as:

Options:

A . Distance travelled by light in 1299792458 s in vacuum.

B . Distance travelled by light in 1439898458 s in vacuum.

C . Distance travelled by light in 1399792458 s in vacuum.

D . Distance travelled by light in 1254792458 s in vacuum.

Answer: Option A
:
A
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 m s^{- 1}

in a vacuum.
We know,

s p e e d = \frac{d i s t a n c e}{t i m e} \Rightarrow t i m e = \frac{d i s t a n c e}{s p e e d}

Given, distance

= 1 m

∴ t i m e = \frac{1}{299792458} s

i.e.,One meter is the distancetravelled by light in

\frac{1}{299792458} s

in vacuum.

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