The atomic mass (including electrons) of helium-4 is

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

Problem

The atomic mass (including electrons) of helium-4 is 4.002603 u4.002603\,\text{u}. Given • mp=1.007276 um_p = 1.007276\,\text{u}, • mn=1.008665 um_n = 1.008665\,\text{u}, • me=0.000548 um_e = 0.000548\,\text{u}, • 1 u=931.5 MeV/c21\,\text{u} = 931.5\,\text{MeV}/c^{2}, answer the following. (i) Obtain the mass of the   24He^{4}_{\;2}\mathrm{He} nucleus by making the necessary correction for the electron masses. (ii) Compute the mass defect of the helium-4 nucleus in atomic mass units. (iii) Calculate the binding energy per nucleon for helium-4 in MeV.

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