Each colour within the visible light spectrum has its own narrow band of wavelength and frequency. An object appears to be black if it absorbs all the wavelengths of visible light. For example, an ...

For example, a pure red may consist of photons ... with wavelengths spread fairly evenly across a wide range of the visible spectrum. LEDs and other electric light sources are not quite as uniform ...

Often a phrase is used to help remember the order of the groups of the electromagnetic spectrum such as Roman ... a range of frequencies. For example, visible light contains the limited range ...