Why are radios signals broadcast in kilohertz and megahertz?

Radio signals are broadcast in kilohertz (kHz) and megahertz (MHz) because these units effectively represent the frequencies used for various communication purposes. Kilohertz typically covers lower frequency ranges, suitable for AM radio and certain communication systems, while megahertz encompasses higher frequencies used for FM radio, television, and other wireless communications. These frequency ranges allow for efficient transmission and reception of signals over varying distances and conditions. Additionally, using standardized units like kHz and MHz facilitates easier communication and coordination among different broadcasting services.