Consider a conducting sphere with a radius as of 1 m. what is the rcs of this sphere at an rf of 10 ghz? give the answer in units of both square meters and dbsm. (assume the sphere is "much larger than" the wavelength.) what must be the side length at of a trihedral so that it has the same rcs at 10 ghz? what is the ratio of the size of the sphere compared with that of the trihedral, as/at ?

wavelength divides in half and speed stays the same.

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.