NGA 21 Locating and Marking of Facilities Practice Test

The concept here is how frequency units are formed using prefixes. The prefix kilo- means thousand, and hertz is the unit of frequency (cycles per second). Putting them together gives kilohertz, which equals 1,000 hertz. So functions or signals described in kHz have frequencies of 1,000 cycles per second. This is why the correct interpretation is that kilohertz stands for 1,000 hertz. The other ideas—100 Hz or 1,000,000 Hz—don’t match the prefix meanings: hundred hertz is 100 Hz, and megahertz is 1,000,000 Hz.