Q. Choose the arrangement which shows the increasing value of $e/m$ for $e,p,n$ and $\alpha$-particles
A) $n < \alpha < p < e$
B) $e < p < \alpha < n$
C) $n < p < e < \alpha$
D) $p < n < \alpha < e$
Explanation
(a)
Mass of electron $= 9.1 \times 10^{- 31}$ kg,
Mass of proton $= 1.67 \times 10^{- 27}$ kg
Mass of neutron $= 1.675 \times 10^{- 27}$ kg
Mass of $\alpha$-particle $= 6.67 \times 10^{- 27}$ kg
So, increasing order of $e/m$ for $e,p,n$ and $\alpha$-particle is $e > p > \alpha > n(\because$ neutron has no charge)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.