Question

The speed of light is ............ km/s. Fill up the blank and give reason.

Answer 1

It’s 300000(3lakhs km per second.in vacuum and yes also note that this value is not constant for every medium . It was calculated by maxwell in his theory of electromagnetic waves

Answer 2

Answer:

Speed of light in km/s = $3\times 10^{5} km/s$

Explanation:

We know the speed of light is $3\times 10^{8}m/s$

We need to convert the speed of light in km/s

So, convert the meter into the kilometer.

we know that

1 km = 1000 m

So , $1 m = 10^{-3} km$

So, speed of light in km/s = $3\times 10^{8}\times 10^{-3}$

So, speed of light in km/s = $3\times 10^{5}km/s$