The owner of a window-treatment company wants to design shades that will cover the windows of a house. the shades should also warm the house by maximizing the absorption of solar energy coming through the windows. which kind of material would best accomplish this task? answers a)black and textured b)black and smooth c)white and textured d)white and smooth

a) black and textured

Explanation:

A black body is a good radiator and absorber of heat energy. To achieve his goal, he should use a black material which would absorb heat coming the sun through the window and radiate it inwards the house. Also, the surface should not be smooth, so as to reduce the amount of heat that would be reflected by it.

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.