Ahand crank generator produces electricity when the handle is turned. the generator is hooked up to a light bulb. when the handle is turned, the light bulb lights up. which of these is the best explanation of what is occurring here? a) the work done on the handle is converted into electricity and used to light the bulb. b) turning the handle pushes electrons in a wire through the light bulb. c) the generator excites atoms which makes the atoms glow. d) kinetic energy is lost and heat is generated.

i'm only doing this for the points : (

explanation:

i'm only doing this the points

1= 26.17

2= 1.17

3=30.86

4=5.86

just took the assigment on edge

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.