Match the missing word with the sentence where it belongs.
1. The spongy, inner tissue of a bone is called tissue.
2. The inner cavities of bones are filled with
3. The bones are operated by to produce body movements
4. The hard, outside part of a bone is called tissue.
5. Red blood corpuscles are formed in the marrow of bones.

a. bone marrow
b. compact or dense
c. cancellous
d. bone
e. muscle

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.

a) the event horizon, singularity, and the chute located between the two.