State the purpose AND describe how of each of the following elements in a
dual-beam spectrophotometer functions:
(a) source, (b) monochrometer, (c) sample cuvette, (d) reference cuvette, (e) detector
In dual beam spectrophotometer
two different light sources are used. One UV another visible. They
are passed through a monochromator, and then passed through the
sample couvette and reference couvette simultaneously, and measured
by the detector.
State the purpose AND describe how of each of the following elements in a dual-beam spectrophotometer...
Which of the following statements regarding double beam spectrophotometers is NOT true? A. The reference beam allows for automatic correction for source intensity fluctuations. B. Comparison of the power emerging from the sample and reference beams determines absorbance and transmittance. C. The reference beam allows for automatic correction for detector drift. D. The reference beam is created using a stationary mirror. E. The reference beam is created using a rotating mirror.
10. (8 pt) The light intensity from the reference cell in a dual-beam spectrometer (Po) is 0.50 W/cm2. The light intensity from the sample (P) is 0.025 W/cm. a. What is the transmittance of the sample? b. What is the absorbance of the sample? After opening the instrument, the cover is left open at a crack letting some stray light hit the detector at 0.010 W/cm2 c. What is the apparent absorbance as a result of the stray light?
question: double beam UV - VIS spectrophotometer offer the advantge (s) of:- ( multiple choice question ) a) compensate for short term fluctuation in the radiant source and drifts in transducers b) compensate for variations in source intensity with wavelength c) enables continuos recording of absorbance of sample without the blank d) all of the above are correct
For each of the following beams, state the expected flexural failure mode-plastic hinge, lateral torsional buckling (LTB), or local buckling The compression flange of each beam is traced at the locations marked with " "If the failure is by LTB. is it elastic or inelastic? Reference any charts or tables used and fully explain your answer. List any assumptions you have to make and be sure to consider in determining which limit state will control (a) The beam below is...
Help please
1. For each of the following elements: write an electron configuration, state what the outermost level is, state how many valence electrons it has, write an orbital diagram, and write an electron dot representation a) Ge b) Po
Questions 1-3 please. The correct answers are circled. Please
just explain the theory proving why the answer is correct and the
others are wrong.
Thanks!
1. Why the detector and the light source in a fluorescence spectrophotometer is perpendicular to each other (90°)? (a). to prevent power fluctuation (b). to eliminate fluorescence (c). to protect the detector from damaging. (d). to protect light source from damaging. (e to protect the detector from being interfered. 2. A hydrocarbon compound is to...
28. How many 4d electrons are in an atom of each of the following elements? a) Y: b) Ag: c) Cs: d) Tc:
Titration lab State the purpose of this experiment. Describe the function of the phenolphthalein in this experiment. How would this experiment be different if you had forgotten to add the phenolphthalein State evidence from the lab that the endpoint was reached. It takes 75ml of a 2.5M HCl solution to neutralize 55ml of a base of unknown concentration. Calculate the concentration of an unknown basic solution. If the actual concentration of the HCl was 0.33M what is your percent error?...
MULTIPLE CHOICE: 1. How would you best describe the purpose of the following code? f = 0; for (i = 1; i < N; ++i) if (a[i] >= a[f]) f = i; a. Rearrange the first N components of array a in descending order. b. Rearrange the first N components of array a in ascending order. c. Place the largest component of array a in position N. d. Compute the value of the largest component in array a. e. Determine...
13 of 19 Which of the following best descnibes a dual purpose test? O a Performing two substantive tests at the same time b. Performing testwork over two significant accounts at the same time O c. Performing two tests of controls at the same time O d Perfor 14 of 19 Which of the following statements about internal controls is correct? O a Controls are actions taken by management to prevent or detect and correct material misstatements O b. Effective...