高次諧波.固定長(zhǎng)度的弦震動(dòng)產(chǎn)生聲音,其有多個(gè)本征模,對(duì)應(yīng)波長(zhǎng)是弦長(zhǎng)度的半整數(shù)倍.
頻率是整數(shù)倍.
基頻是220Hz的弦,440Hz,660Hz,880Hz也是其本征頻率.然而,對(duì)440Hz的弦,220Hz不是其本征頻率.
The key on a piano corresponding to the note of freqency 880Hz is depressed very gently,so that the hammer does not stri
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?
英語(yǔ)人氣：364 ℃時(shí)間：2020-06-03 18:16:48
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