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Vocab

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Absorption Spectrum   A graph that shows electromagnetic radiation absorbed as a function of frequency.  
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Carotenes   A class of compounds responsible for the color of carrots and fall leaves  
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Chlorophylls   A class of compounds found in plant leaves that produce their green color.  
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Electric Field   The area around a charged particle where forces are experienced.  
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Electromagnetic Radiation   Radiation that is propogated by the combination of electric and magnetic fields including gamma rays, x rays, ultraviolet light, visible light, infared light, microwaves, and radio waves.  
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Electronic Relaxation   An electronic transition in which an electron goes from a higher energy orbit to a lower energy one  
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Electronic Transition   When the electrons in an atom or molecule move from one energy state to another.  
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Energy State   The electron configuration of a molecule or atom with electrons in a perticular orbits and therefore at particular energies.  
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Excited State   An unstable state for an atom or molecule in which energy has been absorbed but not reemitted.  
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Fluorescence   The fast emission of light following electronic excitation.  
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Frequency   For a wave, the number of cycles or crests that pass through a point in one second, usually reported in units of cycles per second or hertz.  
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Gamma Rays   The shortest wavelength and most energetic form of electromagnetic radiation.  
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Infared Light (IR)   That portion of the electromagnetic spectrum that is immediately adjacent to red light. I  
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Laser   An acronym for light amplification by stimulated emission of radiation.  
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Laser Cavity   In a laser, the lasing medium is placed inside a laser cavity consisting of two mirrors, one of which is only partially reflecting.  
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Lasing Medium   Laser light is formed by putting electrical or light energy into an element or a compound called the __________  
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Magnetic Field   The area around a magnet where forces are experienced.  
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Magnetic Resonance Imaging (MRI)   A type of spectroscopy involving magnetic fields and radio waves that allows medical doctors to image organs and structures within the human body  
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Microwave Radiation   The fraction of the electromagnetic spectrum that is between the infared region and the radio wave region.  
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Nuclear Magnetic Resonance (NMR)   A type of spectroscopy involving magnetic fields and radio waves and often used by chemists and biochemists to deduce molecular structures.  
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Phosphorescence   The slow emission of light following electronic excitation  
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Photodecomposition   The breaking of bonds within molecules due to the absorption of light  
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Photons   Particles of light  
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Radio Waves   The longest wavelength and least energetic form of electromagnetic radiation  
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Relaxation Time   The time required for nuclei to return to their original orientation after being pushed by electromagnetic radiation  
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Resonance Frequency   The exact electromagnetic frequency that causes an energy transition in a molecule or atom  
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Spectroscopy   The interaction of light with matter  
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Ultraviolet Light (UV)   The fraction of the elecromagnetic spectrum that is between the visible region and the xray region  
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Visible Light   The fraction of the electromagnetic spectrum that is visible to the human eye  
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Wavelenth   The distance between wave crests, usually reported in units of length such as meters or nanometers  
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x-rays   The fraction of the electromagnetic spectrum that is between the ultraviolet region and teh gamma ray region  
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