Which statement about frequency is true?

• A. The time rate at which a signal repeats
• B. The number of cycles per second
• C. The amplitude of the wave
• D. The wavelength of the wave

Answer: (B)

Frequency is how often a periodic event occurs per unit time. The precise, standard description is the number of complete cycles that happen each second, which is measured in Hertz. This makes the statement “the number of cycles per second” the clearest and most exact definition of frequency. The other properties describe different aspects of a wave—amplitude is the height of the wave, and wavelength is the distance per cycle—so they don’t define frequency. The broader phrasing “time rate at which a signal repeats” points to the same idea but isn’t as specific or universally used as cycles per second.