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抖动绳子的一端,在绳中形成机械波,本来是一个简单易行的实验,但如随意拿来一根柔绳演示,效果往往很差。教师演示觉得无趣,学生观察感到无聊。我改用内径12毫米、壁厚3毫米、长6米左右的软橡胶管代替柔绳,效果很好。实验做法是先向管里注满水,两端用橡皮塞塞紧,并用细铁丝扎牢。然后,把橡胶管平放在桌面上,一端让学生握住,另一端教师用
Dithering one end of the rope to form a mechanical wave in the rope is a simple and easy experiment, but if you use a soft rope demonstration at random, the effect is often very poor. Teacher presentations are boring and student observation is boring. I replaced the soft rope with a soft rubber tube with an inner diameter of 12 mm, a wall thickness of 3 mm, and a length of about 6 meters, which worked well. The experimental procedure was to fill the tube with water first, plug it with rubber stoppers at both ends, and fasten it with thin wire. Then, put the rubber tube flat on the table, let the student hold it on one end and use it on the other end