3 An ideal monatomic gas, consisting of 2.8 mol of
volume 8.6x10-2 m² , expands adiabatically. The
initial and final temperatures are 75 °C and -85
°C.
What is the final volume of the gas ?

not too sure thinking it will always be directed towards the centre of the earth. could be wrong not sure

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.

answersysvol bloat;