After exiting the velocity selector, the ions enter the actual mass spectrometer

Question

After exiting the velocity selector, the ions enter the actual mass spectrometer. In this region the same B field exists (B=0.1 T, directed into the paper), but there is no electric field. The ions curve upward, and are then detected. By measuring the diameter of the trajectory, the mass of the singly-charged ions (q=+|e|=1.6x10-19 Coulomb) can be determined. If we want 6Li (mass = 1.00 x 10-26 kg) and 7Li (mass = 1.17 x 10-26 kg) to be separated by a distance x = 0.15 cm at the detector (see figure), what must be the velocity v of the ions entering the mass spectrometer?

Explanation / Answer

(B=0.1 T, directed into the paper),

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