Q. Which has the highest $e/m$ ratio?
A) $He^{2 +}$
B) $H^{+}$
C) $He^{+}$
D) $D^{+}$
Explanation
(b)
$e/m\ ratio\ for\ He^{2 +} = \frac{2}{4}$
$e/m\ ratio\ for\ H^{+} = \frac{1}{1}$
$e/m\ ratio\ for\ He^{+} = \frac{1}{4}$
$e/m\ ratio\ for\ D^{+} = \frac{1}{2}$
$\therefore$ The $e/m$ is highest for hydrogen.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.