阿摩線上測驗
59. How fast is needed for an O2 + ion to move in a circular orbit of radius 5 m in a magnetic field of 0.5 Tesla? (1 u = 1.66 × 10-27 kg)
(A) 3.8 × 105 m/s
(B) 4.1 × 105 m/s
(C) 5.2 × 105 m/s
(D) 7.5 × 106 m/s
(E) 8.9 × 106 m/s
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統計： A(0), B(0), C(0), D(6), E(2) #3233325
統計： A(0), B(0), C(0), D(6), E(2) #3233325
