13. If the population decay channels of the excited state decay include three channels, such as fluorescence channel (kF = 10⁹ s¯¹), internal conversion channel (k_ıc = 10¹² s¯¹), and intersystem crossing channel (k_Isc = 10³ s¯¹), what is the observed fluorescence lifetime TF?
(A) 1 psec
(B) 1msec
(C) 1 nsec
(D) 1 µsec

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