Question

The increasing order (lowest first) for the values of $e/m$ (charge/mass) for electron ($e$), proton ($p$), neutron ($n$) and alpha particle ($\alpha$) is:

• A. $e$, $p$, $n$, $\alpha$
• B. $n$, $p$, ,$e$, $\alpha$
• C. $n$, $p$, $\alpha$, $e$
• D. $n$, $\alpha$, $p$, $e$

Answer 1

The correct option is D $n$, $\alpha$, $p$, $e$

Charge/mass ratio is inversely proportional to the mass and hence electron with lightest mass has the greatest charge/mass ratio followed by protons, alpha particles and neutrons.