Question

Which of these pairs has almost similar masses?

• A. Electron- Proton
• B. Neutron- Electron
• C. Electron- ${}_1{}^{1}H$
• D. Neutron-${}_1{}^{1}H$

Answer 1

The correct option is D

Neutron-${}_1{}^1\mathrm{H}$

PARTICLE	MASS
Electron	$9.1\times {10}^{-31}\mathrm{kg}$
Proton	$1.67\times {10}^{-27}\mathrm{kg}$
Neutron	$1.67\times {10}^{-27}\mathrm{kg}$
${}_1{}^1\mathrm{H}$	$1.67\times {10}^{-27}\mathrm{kg}$(approximately)

Conclusion Statement: Option (d) is the correct answer.