2 Problem 2Assume two adjacent interstellar gas clouds with known thickness dị and d2 found in front of anastronomical light source. Suppose that this source emits a beam of radiation with known specificintensity 1, as it enters the first cloud of interstellar gas. Calculate the specific intensity I, immediatelyafter this beam has traversed the two clouds of gas. Assume that the densities (p1 and p2) and theopacities (k,1 and ky,2) are constant within the clouds and are known quantities and that these cloudspossess no emissivity. (Note the relationship between the opacity and absorption coefficient a, = pk,.See Rybicki and Lightman eq. 1.22.)%3D

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