The ratio of $e / m$ for $H^{+}$ and $H e^{2 +}$ is :

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0.5

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0.25

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Solution

The correct option is A 2
For $H^{+}$ , $\frac{e}{m} = \frac{1}{1} = 1$
For $H e^{2 +}$ , $\frac{e}{m} = \frac{2}{4} = 0.5$
Hence, the ratio of $\frac{e}{m}$ for $H^{+}$ , and $H e^{2 +}$ is $\frac{1}{0.5} = 2$ .

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