Discussion
Match the medium with the behaviour of a wave in it.
1. Lossless dielectric 2. Good conductor 3. Free space
P. Impedance of 377 ohms Q. Attenuation equal to the phase constant R. No attenuation, impedance real and below 377 ohms
Answer: A
The three cases correspond to the three values the ratio of conduction to displacement current can take, and each has its own characteristic impedance and attenuation. Recognising which applies is the first step in any propagation calculation.
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