MCI Radio Wave Propagation Practice Test 2025 – Complete Exam Prep

The correct assertion is that longer wavelengths may travel around obstacles more effectively due to the phenomenon of diffraction. Diffraction occurs when a wave encounters an obstacle or an opening, causing the wave to bend and spread out as it passes around the edges or through the opening.

Longer wavelengths, such as those used in low-frequency radio waves, have a greater capacity for diffraction compared to shorter wavelengths. This means that they can effectively navigate around physical barriers like buildings or hills, allowing the signal to maintain some level of strength and continuity despite obstacles. As a result, this property enhances their ability to cover longer distances and penetrate urban environments where shorter wavelengths might struggle.

In contrast, shorter wavelengths tend to travel in a more direct line and have a reduced ability to bend around obstacles.