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- (A) Calculate the wavelength in nm of an emission line of cadmium with a frequency of 1.311 x 1015 Hz. (B) Calculate the wavenumber in cm-1 of an infrared absorption peak with an associated energy of 5.656 x 10-20 J. Report answers to 4 sig figs. 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.Briefly, but informatively, explain the following as encountered in analytical chemistry: (i) Photoelectric effect (ii) K−absorption edge (iii) Dead time of a detector
- A particular food coloring product has a molar absorptivity of 3.8 × 103 cm−1M−1 at λ max 510 nm. Calculate the absorbance and percentage of transmittance for a solution with a concentration of 2 × 10−4 M measured with a 1 cm cuvette at 510 nm.How does the quantization of energy explain the observedphotoelectric effect and emission of UV energy?Using the equation E = hc/A, calculate the energy of a photon with awavelength of 640.0 nm. Assume h = 6.626 x 10-34 Js and c = 2.998 x108 m s¯¹. Please type answer not write by hendA particular food coloring product has a molar absorptivity of 3.8 × 103 cm−1M−1 at λ max 510 nm. Calculate the absorbance and percentage of transmittance for a solution with a concentration of 2 × 10−4 M measured with a 1-cm cuvette at 510 nm.
- What value of absorbance corresponds to 45.0% T? If a 0.010 M solution exhibits 45.0% T at some wavelength what will be the percent transmittance for a 0.020 M solution of the same substance?.Q1. To determine the concentrations (mol/L) of Co(NO3)2 (A) and Cr(NO3)3(B) in an unknown sample, the following representative absorbance data wereobtained.A (mol/L) B (mol/L) 510nm 575nm5×10−1 0 0.714 0.0970 6×10−2 0.298 0.757Unknown Unknown 0.671 0.330Measurements were made in 1.0 cm glass cells.i. Calculate the four molar absorptivities: ∈A(510), ∈A(575), ∈B(510) and ∈B(575).ii. Calculate the molarities of the two salts A and B in the unknown.Fish-liver oil is a good source of vitamin A, which is mea-sured spectrophotometrically, after correcting for background, ata wavelength of 329 nm.(a) Suggest a reason for using this wavelength.(b) In what region of the spectrum does this wavelength lie?(c) When 0.1232 g of fish-liver oil is dissolved in 500. mL of sol-vent, the absorbance is 0.724 units. When 1.67X10⁻³g of vita-min A is dissolved in 250. mL of solvent, the absorbance is 1.018 units. Calculate the vitamin A concentration in the fish-liver oil
- whar do these ir peaks mean IR 2359.48 1697.05 1610.27Identify the maximum intrabeam permissible exposure (MPE) for the eye:a. CO2 laser for 10 secondsb. HeNe laser for 0.25 secondc. Argon laser for 600 secondsd. XeCl laser for 30,000 seconds7. Explain what is meant by signal in instrumental analysis.