A falling rock is viewed to pass by a window that has a height of 2.2 m in 0.40 s a. Find the V of the rock as it reaches the bottom of the window
b. What height above the window was the rock dropped from, initially?

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

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.