# Dictionary:Attenuation

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1. Reduction in amplitude or energy caused by the transmitting media or system. Usually includes geometric divergence effects as waves spread out from a source as well as conversion of energy into heat (absorption) and other factors affecting amplitude, such as transmissivity losses and mode conversion.

2. Instrumental reduction effects such as might be produced by passage through a filter. See Figure A-2.

Absorption terminology. Sometimes this terminology is used for attenuation because of factors other than absorption. E = energy, ${\displaystyle \Delta E}$ = energy lost in one cycle, ${\displaystyle \lambda }$ = wavelength, f = frequency, x = distance, t = time, ${\displaystyle {\frac {A}{A_{0}}}={\frac {\text{amplitude}}{\text{initial amplitude}}},{\frac {A_{1}}{A_{2}}}={\frac {\text{amplitude}}{\text{amplitude one cycle later}}}}$.[1]