Question

The incident and the reflected voltage are given by 15 and 5 respectively. The transmission coefficient is

(a) 1/3

(b) 2/3

(c) 1

(d) 3

I got this question in unit test.

This intriguing question originated from Power, Power Loss and Return Loss in chapter EM Wave Propagation of Electromagnetic Theory

Answer 1

Right answer is (b) 2/3

For explanation I would say: The ratio of the reflected to the incident voltage is the reflection coefficient. It is given by R = 5/15 = 1/3. To get the transmission coefficient, T = 1 – R = 1 – 1/3 = 2/3.