ATPL EASA Radio Navigation Practice Exam

The unit used to measure frequencies above one million Hertz is megahertz. Specifically, one megahertz is equivalent to one million hertz, which positions it as the standard unit for denoting frequencies within the range of radio frequencies and other applications that involve high-frequency signals, such as in telecommunications and broadcasting. While kilohertz is used for frequencies in the range of thousands of hertz and gigahertz for frequencies in the billions of hertz, megahertz specifically fits the criterion of frequencies between one million and one billion hertz. Hertz is the base unit representing one cycle per second, but it is not sufficient for denoting higher frequencies as clearly as megahertz does. Hence, for the question regarding the measurement of frequencies above one million hertz, megahertz is the correct and most appropriate unit to use.