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1) Positronium consists of an electron and a positron (same mass as electron, but opposite charge)orbiting around their common center of mass. The broad features of the spectrum are thereforeexpected to resemble those of hydrogen, the differences arising largely from the mass relations. At which energy will the first three lines of the Balmer series of positronium appear?
2) Calculate the form of the Zeeman Effect, which occurs when a homogeneous magnetic field of4.0 T (40 kG) is applied to a hydrogen atom in which the transition from the 2p- to the 3d-state is monitored. Which transitions are allowed (considering also the magnetic quantum numberselection rule! Δml= 0,±1), how many lines can be seen in the absorption spectrum and what aretheir energies? Please provide me with an explanation of what are the selection rules about.
if a sample of gas has fixed volume, and under a standard atmosphere of pressure, if its temperature is raised from 20 degrees celsius to 40 degrees celsius
125 mL of H2O is initially at room temperature(22°C). A chilled steel rod at 2°C is placed in the water.If the final temperature of the system is 21.3°C, what is themass of the steel bar
Calculate pCd2 at each of the following points in the titration of 45.00 mL of 0.0070 M Cd2 with 0.0070 M EDTA in the presence of the auxiliary complexing agent NH3.
You are given a compound with an unknown concentration and you have five samples with known concentration of the compound. List 3 pieces of information you need to determine in order to calculate the unknown concentration spectrophotometrically.
the second line of the balmer series occurs at a wavelength of 486.13 nm. what is the energy difference between the
tartaric acid c4h6o6 has two acidic hydrogens. the acid is often present in wines and precipitates from solution as
What is the concentraion of toulene in this sample? Does this exceed the standard? (maximum contaminant level is 1.0 mg/L 6) How much calcium nitrate has to be added to 1000L of solution to provide 130ppm Ca^2+ if the water supply contains 40ppm Ca..
a 10 ml sample of an unknown aqueous nickel 2 solution was treated and found to produce 0.0532g of nidmg2 precipitate.
A beaker with 170 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.70 mL of a 0.370 M HCl solution to the beaker. How much will the p..
some workers responding to the explosion at the Chernobyl nuclear power plant were exposed to 5 sv of radiation, resulting in the death for many of them. if the exposure was primarily in the form of y rays with energy of 3.3 x10^ -14 J
The mixture has a density of .8252 g/l at temperature of 298 and pressure of 1 atm. What percentage of gas in container is He?
warmed then 125 microliters of unknown xylene and 10 mg detergent were refluxed for 45 minutes. Then we added sodium bisulfite until the purple color was gone for one step. What is the role of sodium bisulfite in such a procedure?
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