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A certain minimum energy(E min) is required to eject an electron from a photosensitive surface. Any energy obsorbed beyond this minimum gives kinetic energy to the ejected electron. When 540-nm light falls on a cesium surface, an electron is ejected with a kinetic energy of 6.69 X 10 ^-20 J. When the wavelength is 400 nm, the kinetic energy is 1.96 X 10 ^-19 J.
A) Calculate the minimum energy (E min) for cesium, in joules.
B) Calculate the longest wavelength, in nanometers, that will eject an electron from cesium.
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Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 251 units was obtained for the intensity of the 671 nm red emission line.
Calculate the minimum wavelength of light (in nm) that could break an oxygen-oxygen double bond given that it takes 499 kJ to break on mole of these bonds.
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