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Unit 4 Section B Vocabulary
Radiation and Climate
11
Chemistry
10th Grade
07/20/2012

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Term
electromagnetic radiation
Definition
radiation ranging from low-energy radio waves to high-energy X-rays and gamma rays; includes visible light
Term
electromagnetic spectrum
Definition
comprising the full range of electromagnetic radiation frequencies
Term
photon
Definition
an energy bundle of electromagnetic radiation that travels at the speed of light
Term
frequency
Definition
the number of waves that pass a given point each second; in other words, the rate of oscillation; for electromagnetic radiation, the product of frequency and wavelength equals the speed of light
Term
wavelength
Definition
the distance between corresponding points of two consecutive waves; for electromagnetic radiation, the product of frequency and wavelength equals the speed of light
Term
infrared (IR) radiation
Definition
electromagnetic radiation just beyond the red(low-energy) end of the visible spectrum
Term
ultraviolet (UV) radiation
Definition
electromagnetic radiation beyond the violet end of the visible spectrum; overexposure to this radiation can cause skin damage
Term
greenhouse effect
Definition
the trapping and returning of infrared radiation to Earth's surface by atmospheric substances such as water and carbon dioxide
Term
greenhouse gases
Definition
atmospheric substances that absorb infrared radiation such as CO2, N2O, and CH4
Term
carbon cycle
Definition
the movement of carbon atoms within Earth's ecosystems, from carbon storage as plant and animal matter, through release as carbon dioxide due to cellular respiration combustion, and decay, ro reacquisition by plants
Term
limiting reactant
Definition
the starting substance that is used up first in a chemical reaction; sometime called the limiting reagent
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