Spectral

The specific mix of wavelengths in a light source. This is used in astronomy to determine what stars are made of or how fast they are moving.

The ability of a sensor (like a camera) to distinguish between different wavelengths of light, such as infrared or ultraviolet, beyond what the human eye can see. Spectral

In medicine, spectral features are used to analyze brain waves (EEG) for tasks like sleep staging. 2. Film and Fiction (The Ghostly) The specific mix of wavelengths in a light source

This is the distribution of power over a frequency range, often described using Power Spectral Density (PSD) . It helps engineers see where the "strength" of a signal lies. Light and Imaging: such as infrared or ultraviolet