Modern Physics 5 Question 9
9. 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 $15.9994 amu$ )
$(2005,2 M)$
(a) $7.6 MeV$
(b) $56.12 MeV$
(c) $10.24 MeV$
(d) $23.4 MeV$
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Answer:
Correct Answer: 9. (a)
Solution:
- $4\left({ } _2 He^{4}\right)={ } _8 O^{16}$
Mass defect, $\Delta m={4(4.0026)-15.9994}=0.011 amu$
$\therefore$ Energy released per oxygen nuclei
$$ =(0.011)(931.48) MeV=10.24 MeV $$
