what are the visible by 630
Visible spectroscopy is the study of the interaction of radiation from the visible part (λ = 380 –
720 nm) of the electromagnetic spectrum with a chemical species. Quantifying the interaction of
visible light with a chemical sample allows for the determination of an unknown solution
concentration, the monitoring of reaction progress as a function of time, and many other
quantitative uses.
Understanding visible spectroscopy requires understanding visible light. Light travels in packets
of energy called photons. Each photon has a specific energy related to a certain frequency or
wavelength (E = hν = hc/λ). Visible light consists of wavelengths ranging from 380 nm (blue
violet) to 720 nm (red). When all wavelengths of visible light are present, the light appears
“white” to our eyes. If any wavelength is removed (absorbed), we perceive the remaining
combination of wavelengths of light as the “complimentary” color
