Concept explainers
In Example 27.6 He+ ions with charge +e move at 1.00 × 105 m/s in a straight line through a velocity selector. Suppose the He+ ions were replaced with He2+ ions, in which both electrons have been removed from the helium atom and the ion charge is +2e. At what speed must the He2+ ions travel through the same velocity selector in order to move in a straight line? (i) 4.00 × 105 m/s; (ii) 2.00 × 105 m/s; (iii) 1.00 × 105 m/s; (iv) 0.50 × 105 m/s; (v) 0.25 × 105 m/s.
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