In physics, there is no such thing as negative wavelengths or longer wavelengths. The concept of wavelength refers to the distance between successive peaks or troughs of a wave, and it is always considered a positive quantity.
Wavelength is typically denoted by the symbol λ (lambda) and is measured in units such as meters (m), nanometers (nm), or angstroms (Å). It represents the spatial extent of one complete cycle of the wave.
In electromagnetic waves, which include visible light, longer wavelengths correspond to lower frequencies and lower energy. For example, radio waves have much longer wavelengths than visible light, while gamma rays have much shorter wavelengths. However, these differences in wavelength are expressed as positive values.
Negative values of wavelength do not have a physical meaning within the context of waves. Wavelength is a fundamental property of a wave and represents a positive quantity related to the spatial characteristics of the wave.
It is worth noting that negative values can arise in certain mathematical representations or equations, where they may indicate a phase shift or a relative displacement with respect to a reference point. However, in the physical interpretation of wavelengths, negative values are not applicable.