Propagation

Explanation of question 17

In the HF bands

  1. i and ii are both true
  2. i is true but ii is false
  3. i is false but ii is true
  4. i and ii are both false

The answer is :- 2 To cause refraction of a radio wave, greater ionisation is required as the frequency increases. There is therefore less refraction of radio waves at higher frequencies. A too high frequency can pass straight through the ionosphere.

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