Question: 4. Why do fluorescence spectrometers often use double-beam optics? A. So a reference solution can be used B. To compensate for beam attenuation by the

4. Why do fluorescence spectrometers often use double-beam optics? A. So a reference solution can be used B. To compensate for beam attenuation by the monochromator C. To compensate for power fluctuations in the radiation source D. All of the above

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