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You have two solutions that emit the same amount of fluorescence when excited at 488 nm....

You have two solutions that emit the same amount of fluorescence when excited at 488 nm. One has a fluorescence lifetime of 1 ns and the other has a fluorescence lifetime of 5 ns. You mix the two solutions in the ratio 2:1 in a cuvette (2 times the 1 ns solution and 1 time the 5 ns solution) in a cuvette. Calculate the value of the average fluorescence lifetime tav for this mixture in the cuvette.

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