Question

The speed of light in vacuum is 300000 m per second *

1 point

True

False

​

Answer 1

Answer:

the speed of light =

299 792 458 m / s

Answer 2

Answer:

Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index of 1.3; see Figure 2) and 200,000 kilometers per second in glass (refractive index of 1.5).