Question

The common value for the speed of light in a vacuum is:

Answer 1

The common value for “Speed of light in vacuum” is $\bold{3 \times 10^{8}}$  metre per second.

Answer: Option b

Solution:

Speed of light can be defined as the speed with which light waves propagate in different medium. In vacuum, speed of light is 186,282 miles per second or 299,792 km/s which is rounded off as $3 \times 10^{8} \mathrm{m} / \mathrm{s}$.

“Speed of light in vacuum” is a universal constant and usually represented by ‘c’. Light waves travels at a speed of $3 \times 10^{8}$  metre per second in vacuum.