The horn obviously is a brass instrument and what makes the sound is a vibrating column of air.
显而易见的,圆号是个铜管乐器,它通过震动空气柱来发出声音
Now I didn't use--no hands-- that was just the notes that are naturally on the twelve and a half-foot length of vibrating air.
我没有用手控制,都是十二个半英尺高的震动空气柱,自然产生的音符
You're running, you're shaking a beaker up here at room temperature.
你跑步,震动烧杯,这都是在恒定温度和压强的情况下的过程。
Point of absolute rest in a vibrating string we call a node.
一条绳子上绝对震动静止的点,我们称之为节点。
At the beginning of the rainy season, Baal opens a slit, or makes a slit in the clouds, and thunders and shakes the Earth.
在雨季开始的时候,Baal在云端开一条缝,雷鸣震动大地。
The modes of vibration in that string are quantized.
在那条弦上的震动模式是量子化的。
Here is the pitch in--of--a string an octave higher so you can see it this way. As you probably know, if you take a long string and pluck it, it's going to take that long string a long time to pass that sort of cycle, if you will, just one pass through that cycle.
这也是个音高,一个高八度的音弦,你可以这样这样看 你们可能知道,如果你拨动长弦,长弦要经过很长时间,才能完成一个震动周期,如果你想,可以尝试下
The string is vibrating higher when it's exactly twice what the lower one is.
高音弦的震动频率,正好是低音弦的两倍
All right. So you probably read in the book that the bassoon is a double reed instrument, and so just to show you what that looks like-- You've probably seen it but if you haven't, two pieces of wood vibrate together when I blow through them.
好的,你们可能在书上看到过,巴松管是个双簧乐器,我将为你们演示双簧怎样演奏,你们可能见过,如果没有请看我演示,我吹奏时,两个木片会一起震动
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