What is the unit of frequency?

• A. Joules
• B. Watts
• C. Ohms
• D. Hertz

Answer: (D)

The unit of frequency is Hertz. It is the standard unit used to measure how many cycles of a periodic wave occur in one second. The term "Hertz" is named after Heinrich Hertz, who made significant contributions to the understanding of electromagnetic waves.

In the context of radio communication and ham radio, frequency is crucial because it determines the wavelength of the radio waves being transmitted. Different frequencies are used for different communication purposes and have various propagation characteristics, allowing for effective communication.

The other units mentioned, such as Joules, Watts, and Ohms, pertain to different physical concepts: Joules measure energy, Watts measure power, and Ohms measure resistance in an electrical circuit. Since these units represent entirely different characteristics of electrical phenomena, they are not applicable when discussing the measurement of frequency.