Q. If a star can convert all the He nuclei completely into oxygen nuclei, the energy released per oxygen nuclei is ( Mass of the nucleus is 4.0026$\ amu$ and mass of oxygen nucleus is 15.9994$\ amu$)
A) 7.6MeV
B) 56.12MeV
C) 10.24MeV
D) 23.9MeV
Explanation
(c) $4(\ _{2}He^{4}) = \ \ _{8}O^{16}$
Mass defect,
$\ \ \ \ \ \ \ \ \ \mathrm{\Delta}m = \{ 4(4.0026) - 15.9994\}\ amu\ = 0.01\ lamu$
$\therefore$ Energy released per oxygen nuclei
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = (0.011)(931.48)\ MeV$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ = 10.24\ MeV$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.