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The charge to mass ratio of `alpha-` particles is approximately to the charge to mass ratio of protons:

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The charge to mass ratio of `alpha-` particles is approximately to the charge to mass ratio of protons:
A. Half
B. Twice
C. 4 times
D. 6 times
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Correct Answer - B
e/m value of ion `=("magnitude of charge")/("mass number")`
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