Biology 1002B Lecture Notes - Lecture 1: Electromagnetic Spectrum, Photon, Chloroplast

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Electromagnetic spectrum: the complete range of wavelengths of electromagnetic radiation. Light: the portion of the electromagnetic spectrum that we can detect with our eyes: visible light falls under 400-700nm wavelength, light is a wave of photons (light particles, light has no mass. Relationship between wavelength and energy content of a photon: wavelength and energy of a photon are inversely proportional, shorter wavelengths have higher energy photons, longer wavelengths have lower energy photons. Light is absorbed when the energy of a photon is transferred to an electron, moving the electron from its ground state to an excited state. If the energy of a photon matches how much energy it takes for the electron to get to the excited state, the photon will be absorbed. Lower energy (longer wavelengths) do not have enough energy to excite electrons in living organisms. Chlamy lifecycle; why organisms in stressful environments undergo sexual reproduction:

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