Question

PLEASE HELP! Will Medal! Which is true?

Light waves do not change speed as they travel from air through water.
Light waves speed up as they travel from the air through the water
Light waves slow down as they travel from the air through the water.

Answer 1

@texaschic101 @dan815 @Luigi0210 @wio @sammixboo @nincompoop @uri @kropot72

Answer 2

the speed v of light in a medium whose refractive index is n, is given by the subsequent formula:
\[\Large v = \frac{c}{n}\]
where c is the light speed in vacuum
Now the refractive index of air is about 1. Next the refractive index of water is greater than 1, so we can write:
\[\Large {v_{WATER}} = \frac{c}{{{n_{WATER}}}}\]
\[\Large {n_{WATER}} > 1\]
what can you conclude?

Answer 3

@Michele_Laino it will low dows

Answer 4

yes since:
being \[\Large {n_{WATER}} > 1\]
then:
\[\Large {v_{WATER}} = \frac{c}{{{n_{WATER}}}} < c\]

Answer 5

yay
thanks :)

Answer 6

:)