Which of the following pairs has the identica | vedclass

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(A) The $e/m$ ratio (specific charge) is calculated as the ratio of charge $(e)$ to mass $(m)$.For a proton $(H^+)$, $e/m = 1/1 = 1$.For a deuterium i

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An $\alpha$-particle and deuterium ion

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(A) The $e/m$ ratio (specific charge) is calculated as the ratio of charge $(e)$ to mass $(m)$.For a proton $(H^+)$, $e/m = 1/1 = 1$.For a deuterium ion $(D^+)$, charge is $1$ and mass is $2$, so $e/m = 1/2 = 0.5$.For an $\alpha$-particle $(He^{2+})$, charge is $2$ and mass is $4$, so $e/m = 2/4 = 0.5$.Since both the deuterium ion and the $\alpha$-particle have an $e/m$ ratio of $0.5$, they have identical $e/m$ values.

Which of the following pairs has the identical $e/m$ value?

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