The mass of proton is 1.0073 u and that of neutron is 1.0087 u ( u = atomic mass unit). The binding energy of 24 He is

Question

The mass of proton is 1.0073 u and that of neutron is 1.0087 u ( u = atomic mass unit). The binding energy of 24 He is (A) 28.4 MeV (B) 0.061 u (C) 0.0305 J (D) 0.0305 erg

Tardigrade Admin · Accepted Answer

Mass defect =2 M P +2 M N -M He =2 × 1.0073+2 × 1.0087-4.0015=0.0305 ⇒ Binding energy =(931 × mass defect ) MeV =931 × 0.0305 MeV =28.4 MeV

Q. The mass of proton is $1.0073 u$ and that of neutron is $1.0087 u (u =$ atomic mass unit). The binding energy of $_{2}^{4} He$ is

28.4 MeV

0.061 u

0.0305 J

0.0305 erg

Mass defect $= 2 M_{P} + 2 M_{N} - M_{He}$
$= 2 \times 1.0073 + 2 \times 1.0087 - 4.0015 = 0.0305$
$\Rightarrow$ Binding energy $= (931 \times$ mass defect $) M e V$
$= 931 \times 0.0305 M e V = 28.4 M e V$

Q. The mass of proton is 1.0073u and that of neutron is 1.0087u(u= atomic mass unit). The binding energy of 24​He is