Principles of Communication: Propagation MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

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PropagationMediumQuestion 20242

Question

The ionospheric layer most important for long-distance short-wave communication at night is:

A
D layer
B
E layer
C
F layer
Correct
D
G layer

Correct answer

F layer

Explanation

At night the D and E layers largely disappear (recombination). The F layer (200–400 km) merges to F₂ and persists, enabling long-distance short-wave skip. HF waves can bounce multiple times between ionosphere and ground.

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