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Q.

Find the binding energy of an α-particle in MeV from the following data. Mass of He nucleus=4.001265 amu; Mass of proton=1.007277 amu; Mass of neutron=1.00866amu (Take one amu=931.5MeV)

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answer is 29.

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Detailed Solution

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Mass defect  Δm=2mp+mp−M=2(1.007277+1.00866)−4.001265=0.030609amu

∴ Energy related ΔM=Δm×931.5MeV=0.030609×931.5=28.512MeV

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