What is the unit for measuring frequency in radio transmissions?

The unit for measuring frequency in radio transmissions is Hertz (Hz). Frequency refers to the number of cycles of a periodic wave that occur in one second. In radio communications, these cycles are crucial as they determine the specific radio wave's characteristics, such as its wavelength and how it propagates through the environment. Hertz specifically quantifies frequency, indicating how many times a wave repeats itself in one second.

Watt is a unit of power, which measures the rate at which energy is transferred or converted. Decibel is a logarithmic unit used to express the ratio between two values, often power levels, and does not measure frequency. Ohm is the unit of electrical resistance in a circuit. Therefore, Hertz is the only unit in the provided options that directly signifies frequency, making it the correct answer.