( A star to whoever answers the questions right) Number the following objects in order from least to greatest momentum (1 = least and 5 = greatest)

1. Jogging man (1,2,3,4)
2. Fast train (1,2,3,4)
3. Rolling Marble (1,2,3,4)
4. Standing Hippopotamus (1,2,3,4)

e) none of the above answers are correct

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.