Question

The mass of proton, neutron and helium nucleus are respectively $10073\, u$, $10087\, u$ and $40015\, u$ The binding energy of helium nucleus is:

• A. $14.2 \, MeV$
• B. $7.1 \, MeV$
• C. $56.8\, MeV$
• D. $28.4 \, MeV$

Answer 1

Answer: (D)

$28.4 \, MeV$

Answer 2

B.E. of Helium $= (2m_{P}+2m_{N}−m_{He})c^{2} = 28.4MeV$