IGNOU MPH 13 2026 - the coherence time of the emitted radiation.

Question

the coherence time of the emitted radiation.

19 Jan 2026

Answer :

Word Count : 320

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 for atomic emission lines). Then the coherence time is: [ \tau_c = \frac{1}{\Delta \nu} = \frac{1}{10^9}

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