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阳光下,我们拿出一面小镜子,对着太阳来回晃一晃,就可以看到阳光被镜子“转”到了别的地方,我们说,这是阳光被反射了。声音的传播和光线的传播一样,在遇到障碍物时也会产生反射和吸收现象。坚硬、光滑的物体表面对声音有明显的反射作用;相反,柔软、粗糙、多孔的物体表面则能吸收声音。这就好像一面明亮、光滑平整的新镜子能够反射更多的阳光,而一面表面坑洼不平、锈迹斑斑的镜子只能反射到微弱的阳光一样。怎么样?不如我们自己制做一个简单的装置,比较一下不同物体表面对声音的反射和吸收作用吧。
In the sunshine, we took out a small mirror and waved the sun back and forth to see where the sun was mirrored, and we said it was the sunlight was reflected. Sound transmission and light transmission, in the face of obstacles also have reflection and absorption phenomenon. Hard, smooth surface of the object has a clear reflective effect on the sound; the contrary, soft, rough, porous surface can absorb the sound. It’s like a bright, smooth new mirror that reflects more sunlight, and a bumpy, rusty mirror that reflects only rusty faint sunlight. How about it? It’s better to make a simple device than our own, to compare the reflection and absorption of different objects on the surface.