Which of the following particle have non zero ratio? — Atomic Structure Chemistry Question

💡 Solution & Explanation

To have a non-zero specific charge ($e/m$), the particle must carry an electrical charge. Neutrons, neutrinos, and neutral mesons have zero charge ($e=0$), so their $e/m=0$. A positron has a positive charge ($+1e$) and mass equal to an electron, so it has a non-zero $e/m$. Therefore, correct answer is C.