Question

The power transmitted by a wave with incident power of 16 units is(Given that the reflection coefficient is 0.5)

(a) 12

(b) 8

(c) 16

(d) 4

The question was posed to me in quiz.

The origin of the question is Power, Power Loss and Return Loss topic in chapter EM Wave Propagation of Electromagnetic Theory

Answer 1

The correct answer is (a) 12

The best explanation: The fraction of the transmitted to the incident power is given by the reflection coefficient. Thus Pref = (1-R^2) Pinc. On substituting the given data, we get Pref = (1- 0.5^2) x 16 = 12 units. In other words, it is the remaining power after reflection.