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If two radio waves from the same transmitter reach the receiver by different paths at the same time, there will be phase differences between the signals. These phase differences will cause changes in signal strength, so producing the effect known as..
  • A
    fading.
  • B
    duct propagation.
  • C
    super-refraction.
  • D
    scatter propagation.
In general, radio communication signals leave the transmitter and reach the receiver through different paths. They may arrive in phase or with a phase difference. So the signals may travel through different paths and still reach the receiver in phase, which increases the signal strength, or these signals can interfere with each other causing attenuation or even cancellation. Variations of signal strength resulting from interference, shading, multipath propagation and the Doppler effect are called fading. Fading is the destructive interference or the attenuation of the signal power.

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