Word Count : 320

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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 ________ ____ ____ ________ ______.
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