In physics, wavelength refers to the distance between successive peaks or troughs of a wave. It is a fundamental property of waves and is typically represented by the symbol λ (lambda). Wavelength is commonly measured in meters (m), although it can also be expressed in other units such as nanometers (nm), micrometers (μm), or angstroms (Å).
Wavelength is an important characteristic of various types of waves, including electromagnetic waves such as light, radio waves, and X-rays, as well as sound waves and water waves. In the case of electromagnetic waves, the wavelength determines the color of light or the frequency of radio waves.
In simple terms, the wavelength describes the spatial extent of one complete cycle of a wave. For example, in a water wave, it would be the distance between two adjacent wave crests or troughs. In the context of light, different wavelengths correspond to different colors. For instance, red light has a longer wavelength than blue light.