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在解决物理问题中,时常会遇到多解问题,特别是结果含有自然数“n”时,由于考虑问题不周到,常常出现漏解现象.为了反映学生对物理规律的理解程度、分析与综合能力以及思维层次的高低,高考物理试题中也时有出现这类问题.因此,掌握解答此类题型的方法和技巧十分重要.一、题设条件中含有自然数“n”例1如图1所示,为一直线加速器原理的示意图,在真空长隧道中有n个长度逐渐加大的共轴金属圆筒,各筒相间隔的接在频率为f、电压最大值为U的交流电源两极间,筒间间隙极小,粒子从粒子源发出后经过第一次加速,以速度v1
In solving physical problems, there are often multiple solution problems, especially when the results contain natural numbers “n”, due to the lack of considerate issues, often appear to miss phenomenon. In order to reflect the students’ understanding of the physical laws, analysis and The level of comprehensive ability and level of thinking has also occurred in the physics examinations for college entrance examinations. Therefore, it is very important to master the methods and techniques for solving such questions. First, the topic setting conditions include natural numbers “n” Example 1 As shown in Fig. 1, there is a schematic diagram of the principle of a linear accelerator. In the long vacuum tunnel, there are n coaxial metal cylinders of increasing length. Each cylinder is spaced at a frequency of f and the maximum voltage is U. Between the two poles of the AC power supply, the gap between the cylinders is extremely small. After the particles are emitted from the particle source, they are accelerated for the first time, at a speed of v1.