In the mass spectrometer shown above, singly ionized (one electron removed) atom

Question

In the mass spectrometer shown above, singly ionized (one electron removed) atoms are accelerated and then passed through a velocity selector consisting of perpendicular electric and magnetic fields. The electric field is 155 V/m and the magnetic field is 0.0315 T. The ions next enter a uniform magnetic field of magnitude 0.0175 T that is oriented perpendicular to their velocity. (a) How fast are the ions moving when they emerge from the velocity selector? (b) The particles enter the second magnetic field and complete a half curie. The distance from the point where they land on the detector to the point where they enter the second magnetic field is 34.0 cm. What is their mass?

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