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近年高考物理有关“原子物理”的试题中,原子核结构、原子能级、核反应方程和质能方程是考查热点。同学们复习时要注意以下几个方面:(1)衰变规律。高中物理主要介绍了两种衰变:α衰变和β衰变。α衰变规律:每经过一次α衰变,质量数减少4,电荷数减少2(即原子核中的中子数和质子数均减少2)。β衰变规律:每经过一次β衰变,质量数不变,质子数增加1(即原子核中的中子数减
In recent years, college entrance examination physics related to “atomic physics” questions, the nuclear structure, atomic energy level, nuclear reaction equation and the mass energy equation is to examine hot spots. Students review should pay attention to the following aspects: (1) decay law. High school physics mainly introduces two kinds of decay: α decay and β decay. α decay law: every time after α decay, the mass decreases 4, the charge decreases by 2 (ie, the number of nuclei and protons in the nucleus are reduced by 2). β decay law: After each β decay, the same number of mass, the proton number increased by 1 (ie, the number of neutrons in the nucleus minus