What does wavelength measure in a wave?

Wavelength measures the distance between two successive similar points in a wave, such as from crest to crest or trough to trough. This measurement is a fundamental characteristic of waves, allowing us to understand their behavior and properties. For example, in electromagnetic waves, different wavelengths correspond to different types of radiation (like radio waves, visible light, and gamma rays), which is essential for applications in communication and technology. Understanding the wavelength is crucial in fields like optics, acoustics, and various areas of physics, as it directly influences the wave's frequency and speed, linking to the idea that all waves can be characterized by their repetitive nature.