Contains two protons and two neutrons

PHYSICS · Multi-part · CBSE · Physics · Nuclei · Nuclei

Problem

^{4}\text{He}

contains two protons and two neutrons. The masses of a free proton and neutron are

1.0073\,\text{u}

and

1.0087\,\text{u}

, respectively. The measured atomic mass of

^{4}\text{He}

4.0026\,\text{u}

. Neglect electron mass. (a) Calculate the mass defect

\Delta m

of a single

^{4}\text{He}

nucleus in atomic mass units. (b) Convert this mass defect to kilograms using

1\,\text{u}=1.66\times10^{-27}\,\text{kg}