What effect does an increase in broadcasting frequency generally have on signal reach?

• A. It improves the reach and clarity
• B. It decreases the broadcasting range
• C. It causes total loss of signal
• D. It has no significant impact

Answer: (B)

An increase in broadcasting frequency typically decreases the broadcasting range. Higher frequencies have a tendency to be absorbed more by atmospheric conditions, such as rain or other obstructions, which limits the distance that the signal can effectively travel. Higher frequency signals also have shorter wavelengths, which can lead to increased line-of-sight limitations. This means they are less capable of diffracting around obstacles, rendering them less effective at reaching distant receivers compared to lower frequencies, which can propagate further under various conditions.

In contrast, lower frequencies can travel longer distances due to their ability to diffract around obstacles and reflect off the ionosphere, thus reaching receivers that are situated far from the transmitter. Therefore, the impact of an increase in broadcasting frequency leads to a decreased range of the signal.