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| any technique that uses light to measure chemical concentrations. |
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| a procedure based on absorption of visible light |
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| consist of perpendicular, oscillating electric and magnetic fields |
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| electric field in the xy plane, and the magnetic field in the xz plane |
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| the crest-to-crest distance between waves |
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| (v) the number of complete oscillations that the wave makes each second |
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one oscillation per second.
1/second
1 megahertz equals 10^6 sec^-1 |
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| (n) the speed of light in any medium is c/n where c is the speed of light in a vacuum and n is the refractive index of the medium. The refractive index also measures the angle at which a light ray is bent when it passes from one medium into another. |
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| Energy is inversely proportional to wavelength and directly proportional to wavenumber |
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| Red light, with a longer wavelength than blue light, is less energetic than blue light. |
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| electromagnetic spectrum (greatest to least) |
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| cosmic rays, gamma rays, x-rays, ultraviolet, visible light, infrared, microwave, radio |
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| when a molecule absorbs a photon, the energy of the molecule increases. The molecule is promoted to the _________. |
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| if a molecule emits a photon, the energy of the molecule is lowered and the lowest energy state of a molecule is the ground state. |
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