Light has a maximum constant speed in which of the following? A) water.B) red glass.C) the upper atmosphere.D) clear glass.E) between the atoms in glass, water, or the atmosphere.

Question

Light has a maximum constant speed in which of the following? A) water.B) red glass.C) the upper atmosphere.D) clear glass.E) between the atoms in glass, water, or the atmosphere.

IS THIS C THE UPPER ATMOSPHERE?

Answer 1

Speed of light in the medium is

v =c/n,
where c is the speed of light in free space, n is the index of refraction.

n (glass) ≈ 1.5,
n(water) ≈ 1.33,
n(air) ≈ 1.
v(air) > v(water) >v(glass).
Answer: C

Answer 2

it marked me wrong on answering C, the upper atmosphere

Answer 3

Yes, you are correct. The maximum constant speed of light occurs in the upper atmosphere, which is option C. Light travels slower in other materials such as water, red glass, and clear glass, because these materials have a higher refractive index compared to the atmosphere. The speed of light is also reduced when it passes through the space between atoms in any material, including glass, water, or the atmosphere.