IT Communications Progress Test 1 Practice

Reflection of radio waves occurs when waves bounce off a surface due to what?

The surface is flat A boundary between media with different impedances The waves are of high frequency The transmitter power is high

Correct Answer:

A boundary between media with different impedances

Explanation:

Reflection happens when a radio wave reaches a boundary between two media with different impedances. The boundary conditions for electromagnetic fields require the wave to adjust as it crosses the interface, and a mismatch in impedance causes part of the energy to bounce back instead of transmitting smoothly into the second medium. If the impedances are similar, most energy passes through; with a larger difference, more energy reflects. The surface texture affects whether the reflection is a sharp mirror image or scattered, but the fundamental cause is the impedance difference at the boundary. Frequency or transmitter power don’t by themselves create reflection.

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