The electric field between the plates of the velocity selector
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The electric field between the plates of the velocity selector in a mass spectrometer is 1.12x10^5 V/m and the magnetic field is .540 T. A stream of singly charged selenium ions moves in a circular path with radius 31.0 cm in the magnetic field. Determine the mass of one selenium ion and the mass number of this selenium isotope (i.e. the mass in atomic mass units rounded to the nearest integer). One atomic mass unit = 1.66 x10^-27 kg.
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