Question

"Light travels at the rate of 300,000 kilometers per second in a vacuum." Which of these statements is correct about this law?

a. It is a fact in nature which cannot be tested.

b. It is a theory which is not supported by data.

c. It is an observation which cannot be explained.

d. It is a description which does not work under similar conditions.

Answer 1

I think is A

Answer 2

It was tested long before XX century by astronomers so A and B are not correct, D is not correct too because the speed is always the same in vacuum. So we left only with C which is in fact true, though speed of light today is 299,792,458 m/s not 300,000,000. Einstein told us that only light can travel with this speed and no other object in Universe can reach it, but he didn't told us why is it so.

Answer 3

D

Answer 4

Its C like @ArchiePhysics said