Biology 1202B Lecture Notes - Lecture 2: Electromagnetic Spectrum, Photon, Inverse Relation
4 Apr 2020
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Light serves two important functions for life on earth: ultimate source of energy that sustain virtually all organisms, provides many organisms with information about the physical environment in which they live. The energy given off by the sun is electromagnetic radiation. Electromagnetic spectrum: the complete range of wavelengths of electromagnetic radiation. High energy on the left; low energy on the right. Light: the portion of the electromagnetic spectrum that we can detect with our eyes. Inverse relationship between the energy of a photon and the wavelength of light. This transfer of energy excites the electron moving it from its ground state to an excited state single and double bonds allowing them to absorb light. Pigments: molecules that are efficient at absorbing photons at specific wavelengths. Have a region where carbon atoms are covalently bonded to each other with alternating. Pigments are not proteins they are molecules. Each type of pigment absorb light of only certain wavelengths because:
