PLZ HELP Identify three ways we use analog and digital signals in our everyday lives.

a
Analog signals are used to record video and transmit television signals
b
The wireless router converts digital information from a computer or internet source and transmits it as radio waves, then the computer converts the radio waves back to digital signals
c
A cell phone converts your voice into an electrical (digital) signal, which is then transmitted via radio waves (analog signals) to the nearest cell tower
d
All of the above

Explanation:

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speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.