Final answer:
The SI unit for frequency (ν) is Hertz (Hz), which represents the number of oscillations per unit time.
Step-by-step explanation:
The SI unit for frequency (ν) is Hertz (Hz), which is equivalent to cycles per second, or 1/s. The frequency of a wave is measured in hertz (Hz) or s-¹, and it represents the number of oscillations per unit time.