In a mass spectrograph, the masses of ions are determined from their deflections in a magnetic field. Suppose that singly charged ions of chlorine are shot perpendicularly into a magnetic field B = 0.15 T with a speed of 5.0 × 10⁴ m/s. (The speed could be measured by use of a velocity selector.) Chlorine has two major isotopes, of masses 34.97 u and 36.97 u. What would be the radii of the circular paths described by the two isotopes in the magnetic field? (See Fig. 45-1.)

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Negative ion beam X X m₁ m₂ Fig. 45-1 X X B into page X