The mass of a proton is 1.0073 ; u and that o | vedclass

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(A) The helium nucleus ${ }_2^4 	ext{He}$ consists of $2$ protons and $2$ neutrons.Mass of $2$ protons $= 2 	imes 1.0073 \; 	ext{u} = 2.0146 \; 	e

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$28.4 \; 	ext{MeV}$

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(A) The helium nucleus ${ }_2^4 	ext{He}$ consists of $2$ protons and $2$ neutrons.Mass of $2$ protons $= 2 	imes 1.0073 \; 	ext{u} = 2.0146 \; 	ext{u}$.Mass of $2$ neutrons $= 2 	imes 1.0087 \; 	ext{u} = 2.0174 \; 	ext{u}$.Total mass of nucleons $= 2.0146 + 2.0174 = 4.0320 \; 	ext{u}$.Mass defect $\Delta m = (	ext{Total mass of nucleons}) - (	ext{Mass of nucleus}) = 4.0320 \; 	ext{u} - 4.0015 \; 	ext{u} = 0.0305 \; 	ext{u}$.Binding energy $	ext{B.E.} = \Delta m 	imes 931.5 \; 	ext{MeV/u} = 0.0305 	imes 931.5 \approx 28.4 \; 	ext{MeV}$.

The mass of a proton is $1.0073 \; u$ and that of a neutron is $1.0087 \; u$ ($u =$ atomic mass unit). The binding energy of ${ }_2^4 \text{He}$ is (Given: helium nucleus mass $\approx 4.0015 \; u$):

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