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  4. Li nucleus has three protons and four neutrons. Mass of lithium nucleus is 7.016005 amu. Mass of proton is 1.007277 amu and mass of neutron is 1.008665 amu. Mass defect for lithium nucleus in amu is

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Q. Li nucleus has three protons and four neutrons. Mass of lithium nucleus is 7.016005 amu. Mass of proton is 1.007277 amu and mass of neutron is 1.008665 amu. Mass defect for lithium nucleus in amu is

Jharkhand CECEJharkhand CECE 2014

Solution:

Mass defect = mass of nucleons - mass of nucleus
$ =(3\times 1.007277+4\times 1.008665)-7.016005 $
$ =0.040486\,\text{amu} $
$ \approx 0.04050\,\text{amu} $