本题目来源于试卷: Nuclear & Quantum Physics E.5 Stellar Properties & Processes，类别为 IB物理学
[单选题]
In the core of a star, a proton-proton chain reaction takk,jhbmif 7 -3fv9wj .teztjh/f zj*lg 4us9; +is place.
$4^1_1H$→$^4_2He$+$2^0_{+1}β^+$+$2\,ν_e$+$2\,γ$
After the initial stage of the reaction, two positrons annihilate with electrons present in the surroundings. Which of the following correctly shows the nature of the chain reaction and the energy released due to annihilation?
A. Nature of the chain reaction is Fusion ; Energy released is (2)(0.511)MeV
B. Nature of the chain reaction is Fusion ; Energy released is (4)(0.511)MeV
C. Nature of the chain reaction is Fission ; Energy released is (2)(0.511)MeV
D. Nature of the chain reaction is Fission ; Energy released is (4)(0.511)MeV
参考答案: B
本题详细解析:
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