物理是一门以实验为基础的自然科学,我们必须重视物理实验。特别是那些取材方便的小实验,若能自己动手取材做实验,必能激发学习物理的兴趣。1观察音调的高低是由振动频率决定的取若干个规格相同的矿泉水瓶,向其中加入不同质量的水后,再在瓶口吹气可发出音调高低不同的响声。(可联系实际生活中向暖瓶中加开水发出的响声) Physics is a natural science based on experiments. We must attach importance to physics experiments. Especially those small experiments that are easy to draw, if you can do it yourself, you will be able to stimulate the interest in learning physics. 1 The level of observational tones is determined by taking the vibration frequency to take a certain number of mineral water bottles with the same specifications. After adding different quality water to them, blowing air at the bottle mouth can produce different sound levels with different pitches. (You can contact the sound of boiling water in the thermos in real life)