Question

Among the following the lightest particle is :

• A. Electron
• B. Proton
• C. ${\pi }^0$-meson
• D. Neutron

Answer 1

Answer: (A)

Electron

mass of electron $=9.31\times {10}^{-31}kg$
mass of proton $=1.67\times {10}^{-27}kg$
mass of neutron $=1.7\times {10}^{-27}kg$
mass of ${\pi }^{0}meson=264\times 9.31\times {10}^{-31}kg$