Frequency is best described as:

• A. The distance the wave travels in one cycle.
• B. The rate at which vibration occurs in an EM field during transmitter operations.
• C. The time it takes for one cycle to complete.
• D. The amplitude of the transmitted signal.

Answer: (B)

Frequency is the rate at which the electromagnetic field oscillates, i.e., how many cycles occur per unit time. In transmitter operations, this is the rate at which the EM field vibrates, which is why this description fits best. The distance traveled in one cycle is the wavelength, not frequency. The time for one cycle is the period (the reciprocal of frequency). The amplitude is how strong the signal is, not how fast it vibrates.