Which of the following best describes "wavelength"?

Wavelength is best described as the distance between successive crests or troughs in a wave, commonly represented in sinusoidal forms. This distance is crucial in understanding the properties of waves, including their frequency and speed. In simpler terms, it measures how long one cycle of the wave is, typically expressed in meters.

While options like frequency pertain to how many cycles occur in a unit of time, and amplitude refers to the height of the wave indicating its intensity, those concepts do not directly define what wavelength is. Additionally, the speed of light is a separate characteristic of waves that relates to the wavelength and frequency, but again, is not a definition of wavelength itself. Understanding wavelength is fundamental in fields such as physics and engineering, especially in the study of light and sound waves.