Sketch energy level diagrams for a 3-level and a 4-level laser system indicating specifically the pumping, lasing, and fast decay transitions in each case. 04= 6. (10) Radiant power of the fluorescence is expressed during an experiment using the approximate expression derived in the class: DL 2.303kD.ebc. For a 10 M sample with &=103 M'cm in a 1-cm cuvette, what would be the % error in the Q value because of the use of this approximate expression? 9.667 O RO-E -1-30366

Assuming an integrated luminosity of 100 fb is collected at the ATLAS detector at the LHC, calculate the number of h ZZ events where both Z bosons decay to either a ete pair or a u u palr. You may assume that the total Higgs (h) production cross section is o, = 2 x 10' fb, the branching fraction for a Z boson decay to a ee pair is 3.36%, the branching fraction for a Z boson decay to a "u pair is 3.36%, and the branching fraction for a Higgs boson to decay to a pair of Z bosons is 2.7%. Enter your answer in the box below rounded to the nearest integer (e.g. 1234.4 should be entered as 1234). Ancwer

5. s) Lithium in blood serum of a manic-depressive patient treated with lithium carbonate is determined by flame emission spectrometry, using standard additions calibration. 100 ul. of serum diluted to I ml gives and emission signal of 6.7 units. A similar solution to which 10 ul of a 0.010 M solution of LINO3 has been added, gives a signal of 14.6 units. Assuming linearity for the signal, what is the concentration in ppm of the lithium in the blood serum?

The levels of Vitamin B1 in a sample of milk was determined using the Standard Addition method and technique of fluorescence spectroscopy. 18.0 ml of the milk sample was diluted to 20.0 ml using distilled water and then the fluorescence was measured. The resulting signal was 210 units. A spike was made by taking 18.0 ml of the same milk sample, adding 1.0 ml of a 6.0 ppm Vitamin B1 standard solution, and then diluting to 20.0 ml using distilled water. The signal of the spiked milk was 540 units. Calculate the concentration of Vitamin B1 in the original milk sample (in ppm). Report to 3 decimal places.

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6 why it makes sense to use an internal standard in IR spectrometry when its not used in Uv-Vis

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An analyst needs to evaluate the potential effect of an interferent, I, on the quantitative analysis for an analyte, A. She begins by measuring the signal for a sample in which the interferent is absent and the analyte is present with a concentration of 15 ppm, obtaining an average signal of 23.3 (arbitrary units). When analyzing a sample in which the analyte is absent and the interferent is present with a concentration of 25 ppm, she obtains an average signal of 13.7.

An analyst needs to evaluate the potential effect of an interferent, I, on the quantitative analysis for an analyte, A. She begins by measuring the signal for a sample in which the interferent is absent and the analyte is present with a concentration of 15 ppm, obtaining an average signal of 23.3 (arbitrary units). When analyzing a sample in which the analyte is absent and the interferent is present with a concentration of 25 ppm, she obtains an average signal of 13.7. What is the sensitivity for the analyte? What is the sensitivity for the interfering? What is the value of the selectivity coefficient? What is the maximum concentration of interferent relative to that of the analyte (i.e. interferent/analyte), if the error in the analysis is to be less than 1%?

. A sample of cobalt is to be determined using absorption spectrum analysis. A 0.286 g sampleof a cobalt ore is crushed and digested in 1M HNO3. The stock solution is then diluted to 250.0mL in a volumetric flask (assuming the solution has a density = 1.00 g/mL). The analysis thenproceeds as follows: Sample Solution Std Co solution (11.2 ppm) Final Volume Transmittance                                               15.0 mL 0.00 mL 100.0 mL 54.1%                                               15.0 mL 5.00 mL 100.0 mL 19.9%Calculate the percent cobalt in the original ore sample.