Science / Chemistry / Absorption Spectrum: A plot that shows how much radiation a substance absorbs at different wavelengths. Absorption spectra are unique for each element and compound and they are often used as chemical 'fingerprints' in analytical chemistry. The spectrum can represented by a plot of either absorbance or transmittance versus wavelength, frequency, or wavenumber.
Technology / Cell Phones / Spectrum: The range of electromagnetic radio frequencies used in the transmission of sound, data and television. MORE
Technology / Cell Phones / Specific Absorption Rate (SAR): A measure of the rate at which RF energy is absorbed by the body. MORE