Question

ill give brainliest pls help!

When is the speed of light a constant 299,792,458 meters per second?

Select one:
a. In air
b. In water
c. In any medium
d. In a vacuum

Answer 1

Answer:C

Explanation:

Light is a electromagnetic wave.

All electromagnetic waves are transverse in nature.

All medium particles in a transverse wave vibrate perpendicular to the direction of propagation of wave.

The speed of the transverse wave is constant in all media.

So,speed of light is constant in all media.

So in air,water,vacuum or any medium,the speed of light is same and is equal to $299792458ms^{-1}$

Answer 2

Answer:

D. in a vacuum

Explanation:

i even took the test an it came out correct. hope this helps.