1. The problem statement, all variables and given/known data The problem can be found here; http://www.physics.uprm.edu/~mark/courses/FISI3172_I2007/PracticeExamIII.pdf 2. Relevant equations Ok, ok. I made some reaserch, and I found that the; radius of an ion orbit on a mass spectrometer = mv / qB where m = mass, v = velocity, q = charge, B = magnetic field. ok, now, if that holds true then; m = rqB / v 3. The attempt at a solution so, the answers are the following; a) still don't know how the answer. b) increases c) increases d) decreases e) remain the same, since Temperature is not part of the equation, T will be a constant, and therefore the mass of the ions would stay the same? Can anyone verify this? And help me with the answer to A?