Propagation

Explanation of question 29

  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 :- 4 The height of the ionospheric layers varies not only seasonally, but daily; the distances normally quoted above earth are therefore only approximate. lonisation of the D-layer ceases at night.

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