[問題] 樂器有無共振腔的差別
一般樂器會有共振腔來加強聲音的強度
滿足共振條件的聲波可在共振腔內來回反射
達成建設性干涉使得振幅可以提升許多
所以有共振腔的樂器會比沒有的聲音還來的大
可是我想到的是,我們去撥動例如吉他的弦時
不管有無共振腔,撥動的幅度是一樣大
也就是初始條件都一樣,輸入給系統的能量也一樣
所以有無共振腔照理說聽到的聲音都應該一樣大不是嗎?
共振腔算被動元件也無法額外加入能量來提升振幅吧
那為何有共振腔聲音就會比較大呢?
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