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The mass of a H-atom is less than the sum of the masses of a proton and electron. Why is this? |
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Answer» <P> Solution :By Einsteins. equation relation between energy and mass,`E = mC^(2)` E = energy, m = mass decayed (DISINTEGRATED) C = speed of light Here mass defect `Deltam = (m_(p) + m_(e)) - M` M= mass of H atom But binding energy `B*E=DeltamC^(2)` `:.(B*E)/(=DeltamC^(2)` `:.(B*E)/(C^(2))=Deltam=m_(p)+m_(e)-M` `:.M lt m_(p)+m_(e)` Thus, mass of H atom is less than total mass of electron and proton in free state. |
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