The common value for the speed of light in a vacuum is:
3.00 × 106m/s
3.00 × 108m/s
3.00 × 1010m/s
3.00 × 1012m/s

The common value for “Speed of light in vacuum” is  metre per second.

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 .

“Speed of light in vacuum” is a universal constant and usually represented by ‘c’. Light waves travels at a speed of  metre per second in vacuum.