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大学物理习题由于表述严密、立意新颖,越来越受到高考命题者的青睐.近三年高考中出现一些改编自大学物理习题的试题.例1 汤姆生用来测定电子的比荷(电子的电荷量与质量之比)的实验装置如图1所示,真空管内的阴极K发出的电子(不计初速、重力和电子间的相互作用)经加速电压加速后,穿过 A′中心的小孔沿中心轴 O_1O 的方向进入到两块水平正对放置的平行极板 P 和 P′间的区域.当极板间不
College physics exercises have become more and more popular among college entrance examination propositions because of their strict expression and innovative ideas. In the past three years, there have been some problems in college entrance examinations adapted from university physics exercises. Example 1 Thomson used to measure the electronic charge (electron charge) The experimental apparatus for the ratio of mass to mass is shown in Fig. 1. The electrons emitted from the cathode K in the vacuum tube (excluding the initial velocity, gravity, and electron interaction) are accelerated by the accelerating voltage and passed through the hole at the center of A'. The direction of the central axis O_1O enters the area between the two parallel plates P and P′ lying horizontally opposite each other. When the plates are not