Which statement best explains what happens when energy transfer occurs between objects and particles? A.
The temperature of an object changes when heat or cold is added.

B.
Heat is a substance that flows from hotter objects to colder objects.

C.
Energy cannot be created or destroyed, only transferred or changed from one form to another.

D.
Energy transfer always moves between objects or particle with higher energy to those with lower energy.

pretty sure it's false

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.

i would say