Transmittance of light

Turbidity as a measure of the relative clarity of a sample is a qualitative characteristic which is imparted by solids obstructing the transmittance of light through the sample. Thus, it is not a direct measure of suspended particles in a sample but, instead, a measure of the scattering effect such particles have on light. 

FIGURE 4.9 Transmission profiles of maple syrup. Profile for each grade was derived from 10-40 scans of individual syrups. Grades delineations are based upon U.S.D.A. standards. Color grade is determined by the transmittance of light at 560 nm. 

Infrared spectra are usually recorded by measuring the transmittance of light quanta with a continuous distribution of the sample. The frequencies of the absorption bands Us are proportional to the energy difference between the vibrational ground and excited states (Fig. 2.3-1). The absorption bands due to the vibrational transitions are found in the... 

The percentage transmittance of light at 250 nm through a certain aqueous solution is 20.0% at 25°C. The experimental cell length is 1.0 cm, and the concentration of the solution is 5 X 10 " mol L . Calculate the absorbance. Calculate the molar absorption coefficient. 

Figure 3-2 Transmittance of light through sample and reference cells. Transmittance of sample versus reference = y. fo...

Reflection type according to Fresnel s law of reflection. Fresnel s law describes the reflectivity and transmittance of light at an interface for the two types of linearly polarized light. Measurement of Ai7 is a measure of change in reflectivity. 

The potential for corrosion caused by adhesives requires evaluations in both cured and uncured states. In one test, the adhesive components or the cured adhesive are applied to aluminized-Mylar film and examined after 48 hours for etching or transmittance of light through the Mylar. A second test involves embedding copper wire with the adhesive and measuring corrosion by resistance changes in copper wire. Because of the wide variety of tests and the fact that they are closely related to adhesive reliability issues discussed in Chapter 6, the reader is referred to that chapter. 

Transmittance (of light) That fraction of the incident light of a given wavelength which is not reflected or absorbed, but passes through a substance ... 

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