3:23

5:51

5:36

3:37

2:58

In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
It is thus the inverse of the spatial frequency. Wavelength is usually determined by considering the distance between consecutive corresponding points of the same phase, such as crests, troughs, or zero crossings and is a characteristic of both traveling waves and standing waves, as well as other spatial wave patterns.
Wavelength is commonly designated by the Greek letter lambda (λ).
The term wavelength is also sometimes applied to modulated waves, and to the sinusoidal envelopes of modulated waves or waves formed by interference of several sinusoids.

### Sinusoidal waves

### More general waveforms

### Interference and diffraction

### Subwavelength

### Angular wavelength