Question

Which has the highest $e/m$ ratio?

• A. $H{e}^{2+}$
• B. $H^{+}$
• C. $H{e}^{+}$
• D. $D^{+}$

Answer 1

Answer: (B)

$e/m$ ratio for $H{e}^{2+}=\frac{2}{4}$
$e/m$ ratio for $H^{+}=\frac{1}{1}$
$e/m$ ratio for $H{e}^{+}=\frac{1}{4}$
$e/m$ ratio for $D^{+}=\frac{1}{2}$
$\therefore$ The $e/m$ is highest for hydrogen.