袖珍收音机是一种很常见的小家电,或许我们的同学手上都有,用它来演示声音的发生,声音的传播,以及响度与振幅、距离的关系,演示噪声的产生及其危害等等有关声现象的实验,不仅取材容易、操作简便,而且效果明显,能增强实验的趣味性,引发对学习知识 Pocket radio is a very common small home appliance, perhaps our classmates have on hand to use it to demonstrate the occurrence of sound, the spread of sound, and the relationship between loudness and amplitude, distance, demonstration of noise and its harm, etc. The experiments on acoustic phenomena not only make the materials easy to use, and they are easy to operate. The effect is obvious, and it can enhance the fun of the experiment and cause learning knowledge.