Use the graph to complete the statement below. Assume that pressure and number of moles of gas are constant in this problem. This graph shows that temperature and volume have _
(A graph of volume versus temperature has temperature in kelvins from 200 to 400 on the horizontal axis, and volume in liters from 0.5 to 1.5 on the vertical axis. 5 points are marked approximately as follows: 225, 0.75; 250, 0.8; 290, 1; 325, 1.1; and 380, 1.3.)

options are:
a direct linear relationship
an inverse linear relationship
a direct non linear relationship
an inverse non linear relationship

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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.