One day little taehyung found a block of iron, he found out that it's density is 7.8g/cm^3 ,he goes running to RM and Jin and asks what is the mass of 5cm^3 of it is. but RM lost his son koya so he didn't have time to answer, and Jin was eating,
Can you help little taehyung ?
Pleaasse??

the results is a decrease in air temperature with an increase of altitude.

explanation:

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.

answer///scientific method;