Question

If a star can convert all the He nuclei completely into oxygen nuclei. The energy released per oxygen nuclei is : (Mass of the helium nucleus is 4.0026 amu and mass of oxygen nucleus is 15.9994 amu)

• A. 7.6MeV
• B. 56.12MeV
• C. 10.24MeV
• D. 23.4MeV

Answer 1

Answer: (C)

10.24MeV

Answer 2

$4 (_2 He^4 ) = _8O^{16}$
Mass defect. $? m = {4(4.0026) - 15.9994}$
$= 0.011 amu$
$\therefore$ Energy released per oxygen nuclei
$= (0.011)(931.48) MeV$
$= 10.24 MeV$
$\therefore$ Correct answer is (c).