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人教课标版教材八年级上册第一章《声现象》第一节《声音的产生和传播》中在“动手动脑学物理”里有一个习题:“将耳朵贴在长铁管的一端,让另一个人敲一下铁管的另一端,你会听到几个敲打的声音?亲自试一试,并说明其中的道理。”在处理这个习题的时候,我像平时一样,给学生讲解:会听到两次敲打的声音,原因是:声音既可以在空气中传播又可以在固体(铁管)中传播,在铁管中的传播速度比在空气中的传播速度快,因此第一次听到的声音是铁管中传播过来的,第二次听到的
People teach the textbook eighth grade books on the first chapter “sound phenomenon” the first section “the generation and spread of sound” in the “manual brain science” there is a problem: “the ear attached to the long iron pipe Let another person tap the other end of the iron pipe and you will hear a few beating sound? Try it yourself and explain the truth. ”" In dealing with this exercise, I, as usual, Explain to the students that they will hear the sound of two beatings because the sound can be transmitted both in the air and in the solid (pipe), propagating faster in the iron pipe than in the air, So the first time I heard the sound coming from the pipe, I heard it for the second time