Question: B4) please no hand writing solutio AA sample is illuminated by a He-Ne laser having an output power of 50 mW at a wavelength of

B4) please no hand writing solutio

AA sample is illuminated by a He-Ne laser having an output power of 50 mW at a wavelength of 632.8 nm. Assuming 10% of the photons from the laser are absorbed by the sample and the fluorescence quantum yield is 20%. What is the optical density of the sample at 632.8 nm?

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