An atom emits a photon of wavelength X = 600 m by transition from an excited state of life time\[8\times {{10}^{-9}}s\]. If \[\Delta \,v\] represents the minimum uncertainty in the frequency of the photon, the fractional width \[\frac{\Delta v}{v}\] of the spectral line is of the order of

• A. \[{{10}^{-\,4}}\]
• B. \[{{10}^{-6}}\]
• C. \[{{10}^{-\,8}}\]         
• D. \[{{10}^{-10}}\]