Question
Which of the following effects may allow radio signals to travel beyond obstructions between the transmitting and receiving stations?
Answer Options
- A) Knife-edge diffraction
- B) Faraday rotation
- C) Quantum tunneling
- D) Doppler shift
Correct Answer: A
Explanation
Knife-edge diffraction is a phenomenon where radio waves are bent or scattered when they encounter a sharp, hard obstruction, such as a mountain ridge or the corner of a tall building. The wave essentially bends around the sharp edge of the obstruction.
This effect is particularly useful in mountainous or urban areas, allowing a usable signal to be received even if the direct path between stations is completely blocked. It enables communication far better than a simple shadow effect would predict.
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