The key on a piano corresponding to the note of freqency 880

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/07/14 06:49:55

The key on a piano corresponding to the note of freqency 880Hz is depressed very gently,so that the hammer does not strike the string,but the damper is lifted and the string is free to vibrate.When the key corresponding to the note of frequency 440Hz is struck firmly,it is found that the 880Hz string also vibrates.Give a brief explanation of this phenomenon.Suppose the 220Hz string had also been free to vibrate.What frequencies,if any,would it have emitted when the 440 Hz key was struck?

高次谐波.固定长度的弦震动产生声音,其有多个本征模,对应波长是弦长度的半整数倍.
频率是整数倍.
基频是220Hz的弦,440Hz,660Hz,880Hz也是其本征频率.然而,对440Hz的弦,220Hz不是其本征频率.

Tom saw a 100yuan note on the ground on his way( )A.to home whatever the style of note-taking is,the key principle is "s One of the key for my"turning the corner" was to focus on ju a note of the date啥意思? The key to the _____ is on the desk the key to the 英语翻译门的钥匙翻译为什么是 a key to the door 可不可以是a key of the door呢~ 关于key的用法the key to 表示“……的关键”,那表示“……的钥匙”是用“a key of”还是“a key Then mark the corresponding letter on Answer Sheet 2 with a mark the corresponding letter on answer sheet 2 with a singl a set of keys is on the sofa.(on the sofa部分提问）__a set of key The key to the success of any films is to finging a capable