Li nucleus has three protons and four neutrons. Mass of lithium nucleus is 7.03.6005 amu. Mass of proton is 1.007277 amu and mass of neutron is 1.008665 amu. Mass defect for lithium nucleus in amu is
A
0.04048
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B
0.0405
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C
0.04052
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D
0.04055
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Solution
The correct option is D 0.0405 Mass defect = mass of nucleons - mass of nucleus =(3×1.007277+4t008665)−7.016005 =0.040486amu ≈0.04050