Navy Electricity and Electronics Training Series (NEETS) Module 10 Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What is the consequence of the low ionization in the D layer during high-frequency propagation?

Improvement in transmission

Complete obstruction of transmission

Limited frequency range for transmission

The low ionization in the D layer during high-frequency propagation affects the behavior of radio waves as they travel through the ionosphere. Specifically, when ionization levels are low, there is less free charge available to reflect or refract high-frequency signals. This leads to a restriction in the effective range of frequencies that can be transmitted effectively. Consequently, only certain frequencies will be able to propagate through the D layer, emphasizing the limited frequency range for successful transmission.

In contrast, higher frequencies tend to be more susceptible to being absorbed rather than reflected in a low-ionization environment, thereby limiting their propagation capabilities. As a result, lower frequencies are generally preferred in regions with significant low ionization to ensure better transmission, supporting the idea that the ionization levels directly influence which frequencies can be successfully propagated.

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