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Explain how beam chopping reduces line noise and noise from source drift.
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- An absorption measurement with a 1 cm path length yields a reading of 0.004 absorbance units with a noise of 0.001 absorbance units and a mean noise reading of 0 for 10 scans averaged together. Assuming the noise for a single scan does not change if the path length is increased to 6 cm and the number of scans is increase to 100, what is the signal to noise of the new measurement.How to find the signal-to-noise ratio from data given? How many measurements would have to be averaged to obtain a S/N of 500? Explanation for each step will be greatly appreciated.7. Suppose you are an employee of a plastics firm and you are assigned the task of identifying a polymer used by a competitor to make certain automotive parts. You prepare a film of the polymer and determine its IR spectrum, as shown below. What information can you deduce from the spectrum? Spectrum below plots transmittance (y-axis) vs. frequency in wavenumber (cm³¹) T прити JU 0 0 0 0 0 1000 3000 2000 1500 1000 500
- White light is directed to a reflection grating at an incident angle of 45 degrees. How many grooves per mm should the grating have to diffract first order 666 nm light at an angle of -10 degrees. Round your answer to the nearest 1 groove/mm.Your calibration curve will be generated using absorbance and concentration data. However, you collected %Transmittance data in the lab. Could you use a plot of %Transmittance versus concentration to generate a calibration curve? Why or why not?What percent transmittance range and what absorbance range are considered to be the optimum working ranges for spectrochemical measurements?
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