48 you are given two amplifiers, a and b, to connect in cascade between a 10-mv, 100-k source and a 100- load. the amplifiers have voltage gain, input resistance, and output resistance as follows: for a, 100 v/v, 100 k,10k, respectively; for b, 10 v/v, 10 k,1 k, respectively. your problem is to decide how the amplifiers should be connected. to proceed, evaluate the two possible connections between source s and load l, namely, sabl and sbal. find the voltage gain for each both as a ratio and in decibels. which amplifier arrangement is best?

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.