Calculate frequency of light emitted by a hydrogen a atom
1.-What is the energy of a mole of photons associated withblue light of wavelength 4.75x102 nm?
2.-Calculate the frequency of the light emitted bya hydrogen atom during a transition of its electron from the n= 4 to the n = 2 principal energy level.
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Studies have shown that the concentration (in mg/cm3 of blood) of aspirin in a typical person is related to the time t (in h ) after the aspirin reaches maximum concentration by the equation ln c = ln 14-0.32t.
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Calculate the frequency of the light emitted by a hydrogen atom during a transition of its electron from the n= 4 to the n = 2 principal energy level.
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According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 2.5x103m/s,the uncertainty in this position (in m) is at least (mass electron= 9.11x10-28g):
Sodium chloride, NaCl, crystallizes in a face-centered cubiclattice of chloride ions, with the smaller sodium ions occupyingholes between the chloride ions. How many Cl- ions are in contact with any single Na+ ion?
A propeller blade spinning at 4500 rpm has blades that are 3.00 feet long. How fast (in ft/s) are the tips of the blades moving through the air?
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