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The coherence time ( \tau_c ) of emitted radiation is related to the spectral width ( \Delta \nu ) of the source by the relation: [ \tau_c \approx \frac{1}{\Delta \nu} ] If the radiation has a finite linewidth due to natural broadening, Doppler broadening, or other effects, the spectral width ( \Delta \nu ) can be used to calculate the coherence time. For example, consider a source with a spectral width ( \Delta \nu = 10^9 , \text{Hz} ) (typical ________ ___ _________ _______ ___ ________ ___.
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