The refractive index of water is

. This means that the speed of the light in the water is:

The relationship between frequency f and wavelength

of a wave is given by:

where v is the speed of the wave in the medium. The frequency of the light does not change when it moves from one medium to the other one, so we can compute the ratio between the wavelength of the light in water

to that in air

as

where v is the speed of light in water and c is the speed of light in air. Re-arranging this formula and by using

, we find

which is the wavelength of light in water.
It is impossible to get to the center of the earth using a volcano for the following reasons --
1) Lava is super hot, so if you go into a volcano and touch the lava, or get too close, you could get severely injured
2) The center of the earth is even hotter! It's possible for people to melt, so you would most likely melt if you were trying to get to the center of the earth.
Hope this helps! :D
Answer:
0.28 ft
Explanation:
We are given that
Strength=m=
Distance between source and sink=15 ft
Distance between the sink of the source and origin=
ft
Uniform velocity, U=12 ft/s
We have to find the length of the oval.
Formula to find the half length of the body

Where a=Distance between sink of source and origin
U=Uniform velocity
m=Strength
l=Half length
Using the formula



Length of oval=
Answer:
where is the diagram..........
Answer:
For example: Freezing, boiling, are physical
Explanation: