ARRL Technician Practice Exam

What is the unit of frequency?

1. Decibel

2. Hertz

3. Ohm

4. Farad

The correct answer is: Hertz

The unit of frequency is Hertz, which is defined as one cycle per second. This means that if a signal oscillates or alternates once in one second, it has a frequency of 1 Hertz. Frequency is a key parameter in radio communications, as it determines how a signal is transmitted and received. In practice, higher frequencies can carry more data but may have different propagation characteristics compared to lower frequencies. Decibel is a unit used to measure the intensity of sound or power levels, while Ohm is the unit of electrical resistance. Farad, on the other hand, is the unit for capacitance in electrical circuits. None of these are applicable to measuring frequency, which is why Hertz is the only correct answer in this context.