The \( e / m \) ratio of a particle of charge 2 unit and mass 4 amu is (a) \( 4.8 \times 10^{7} ...

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The \( e / m \) ratio of a particle of charge 2 unit and mass 4 amu is
(a) \( 4.8 \times 10^{7} \mathrm{C} / \mathrm{kg} \)
(b) \( 0.5 \mathrm{C} / \mathrm{kg} \)
(c) \( 4.8 \times 10^{4} \mathrm{C} / \mathrm{kg} \)
(d) \( 8 \times 10^{-20} \mathrm{C} / \mathrm{kg} \)
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