Question

15．下列說法正確的是（　　）

• A． $\left.\begin{array}{l}{3}\\{2}\end{array}\right.$He+$\left.\begin{array}{l}{2}\\{1}\end{array}\right.$H→$\left.\begin{array}{l}{4}\\{2}\end{array}\right.$He+$\left.\begin{array}{l}{1}\\{1}\end{array}\right.$H是核聚變反應(yīng)
• B． $\left.\begin{array}{l}{238}\\{92}\end{array}\right.$U→$\left.\begin{array}{l}{234}\\{90}\end{array}\right.$Th+$\left.\begin{array}{l}{4}\\{2}\end{array}\right.$He是人工核轉(zhuǎn)變
• C． $\left.\begin{array}{l}{24}\\{11}\end{array}\right.$Na→$\left.\begin{array}{l}{24}\\{12}\end{array}\right.$Mg+$\left.\begin{array}{l}{0}\\{-1}\end{array}\right.$e是β衰變反應(yīng)
• D． $\left.\begin{array}{l}{234}\\{90}\end{array}\right.$Hh→$\left.\begin{array}{l}{234}\\{92}\end{array}\right.$Pa+$\left.\begin{array}{l}{0}\\{-1}\end{array}\right.$e是α衰變反應(yīng)
• E． $\left.\begin{array}{l}{235}\\{92}\end{array}\right.$U+$\left.\begin{array}{l}{1}\\{a}\end{array}\right.$n→$\left.\begin{array}{l}{92}\\{36}\end{array}\right.$Kr+$\left.\begin{array}{l}{141}\\{56}\end{array}\right.$Ba+3$\left.\begin{array}{l}{1}\\{0}\end{array}\right.$n是裂變反應(yīng)

Answer 1

分析 β衰變生成的是電子，α衰變生成的是α粒子；裂變是重核裂變成輕核，聚變是輕核生成重核

解答 解：A、為輕核生成重核，為聚變反應(yīng)，則A正確
B、為α衰變，則B錯誤
C、為β衰變，則C正確
D、為為β衰變，則D錯誤
E、為重核裂變成輕核，是裂變，則E正確
故選：ACE

點(diǎn)評 正確書寫核反應(yīng)方程是學(xué)習(xí)原子物理的重點(diǎn)，要注意質(zhì)量數(shù)和電荷數(shù)守恒的應(yīng)用，同時對于原子物理的基礎(chǔ)知識要注意加強(qiáng)記憶和積累