An A appears in front of the spectrometer

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A reading of 100% Transmittance means all the light passed through, while 0% Transmittance means all the light was blocked or absorbed by the solution. Absorbance (A) is the preferred unit for most quantitative scientific analysis because of its proportional relationship to. A spectrophotometer is used to measure how much light is absorbed by a sample at varying wavelengths. In this instrument, a beam of monochromatic light is directed through a solution and the intensity of light transmitted (I t) is compared to the intensity of the incident beam (I o), as shown in. In spectroscopy, we use light to determine a tremendous range of molecular properties, including electronic, vibrational, rotational, and electron and nuclear spin states and energies.

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