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Absorption of Light

Light energy initiates the process of photosynthesis when pigments absorb the light. Necessary pigments have a narrow variety of energy levels the they can absorb. Energy levels reduced than those stood for by red irradiate are poor to advanced an orbital electron to an excited, or quantum, state. Power levels higher than those in blue light will physically tear the molecules apart, a procedure called bleaching. For example, retinal pigments have the right to only “see” (absorb) 700 nm to 400 nm light; this is clearly shows light. Because that the very same reasons, tree pigment molecules absorb only light in the wavelength variety of 700 nm to 400 nm; tree physiologists refer to this variety for plants together photosynthetically-active radiation.

The clearly shows light watched by people as the shade white light in reality exists in a rainbow of colour in the electromagnetic spectrum, v violet and blue having shorter wavelengths and, thus, greater energy. In ~ the other finish of the spectrum, toward red, the wavelengths are longer and also have reduced energy.