What happens to an antenna that is longer than another?

When an antenna is longer than another, it operates at a lower resonant frequency. This relationship is largely due to the fact that the resonant frequency of an antenna is inversely proportional to its length. A longer antenna can accommodate longer wavelengths, which correspond to lower frequencies, resulting in enhanced performance at those frequencies.

In terms of practical application, this means that antennas designed for lower frequencies tend to be larger, which allows them to resonate effectively at those frequencies. The resonant frequency is the frequency at which the antenna is most efficient at receiving or transmitting signals, and in general, maximizing the length allows for better reception and transmission capabilities at the lower end of the frequency spectrum.

Other options do not accurately reflect the principles of antenna operation. For instance, a higher resonant frequency would imply a shorter antenna, and efficiency typically improves with proper matching of the antenna length to the operating frequency. Similarly, the idea that an antenna emits only a continuous wave does not directly pertain to its length but rather to the type of modulation used in signal transmission.