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Unformatted text preview: MSE 202 1/28/2011 Page 1 of 4 Poisson D ist r ib u t ion and Signa l / No ise Rat io Discrete probability function binomial distribution o Not a continuous curve stepping o Examples The number of cars that stop at a red light in a give hour can be described by a poisson distribution Radioactive decay The number of impurities in a material per given volume Relates the number of impurities on the microscopic scale to properties of the bulk (macroscopic scale) Signal/noise ratio ratio of signal strength to background noise o use to get rid of all of the background radiation o used for SEM, TEM, x-ray diffraction, and in audio systems o signal/noise scales as ( ) Number of trials F l uo rescence Cont i n ued x-ray emissions have specific labels (K,L,M) that relate to the energy levels of an atom MSE 202 1/28/2011 Page 2 of 4 The 3p orbitals split into 2 energy levels (not completely degenerate) Elect ron originated from K shell (1s orbital)...
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- Spring '09