A mass spectrometer uses sulfur isotopes of mass numbers 32, 33, and 34 from a meteorite sample. The directions of the electric field between the plates and the magnetic fields are shown below. The marks formed by singly charged ions of each type on a detector film are equally spaced by 0.0017 m. Determine the new spacing on the detector if the ions are doubly charged.

• A. $4.3\times10^{-4}\mathrm{~m}$
• B. $8.5 \times 10^{-4} \mathrm{~m}$
• C. $1.7 \times 10^{-3} \mathrm{~m}$
• D. $3.4 \times 10^{-3} \mathrm{~m}$

Answer: (B)