英语百科——空瓶子打造音乐高手

 英语百科——空瓶子打造音乐高手

YOU WILL NEED 实验器具

* Five identical plastic bottles 五个一样的塑料瓶

* Water 水

HERE’S HOW

Fill five identical plastic bottles with varying amounts of water. Arrange the bottles in order from most to least full. Blow across the top of each bottle and compare the different sounds you make.

将这五个一样的塑料瓶灌好不等量的水，并将瓶子按照所盛的水量，由多到少排列。对着相邻两个瓶嘴间的空隙吹气，比较听到声音有何不同。

WHY? 实验原理

Changing the amounts of air and water in the bottles lets you change the pitch—how high or low the sound is. When you blow across the tops of the bottles, you are making the air inside vibrate. In bottles with more air, vibrations are slower, so the pitch is lower.

重点词汇

Identical： 相同的，一模一样的；identical twins：同卵双胞胎

Vary：v,变化； varying：不同的，变化的

Arrange in order：按顺序排列

Vibrate：v.  振动，颤动；n. vibrating

Fill a glass halfway with water. Wet your finger by dipping it into the water. Slowly circle the moist finger around the rim of the glass. Keep moving your finger at a steady rate. Make sure your finger remains moist. When the friction between the moving finger and the glass rim is correct, the glass will begin to “sing”. Try building a complete octave by assembling a set of glasses with different amounts of water. Try doing the experiment with different kinds of glasses.

EXTENSION(扩展游戏)

拿一个玻璃杯，装进半杯水。把手指尖浸湿，轻轻地摩擦玻璃杯杯口边缘。不断的摩擦，且频率均匀，在此期间，你的手指必须保持湿润。当方法正确时，玻璃杯就开始唱歌了。把八个杯子装入不同量的水，你甚至可以擦出一个音阶。再试试不同的玻璃杯，你会有更多发现哦！