發布日期：2021-09-10
在貝殼裡能聽見“海洋之聲”，主要是因為共振，這個現象叫“貝殼共振”（seashell resonance），用一句話簡單概括說就是「耳朵周圍的噪音被貝殼放大了」。其實，我們平時都是處在被各種雜音包圍的環境之中：四周的風聲、電子設備的嗡鳴聲、來往的汽車聲等等，周圍的所有這些聲音加起來形成了有著固定頻率的雜音（白噪音）
根據物理學原理，如果來自貝殼以外的振動或聲音的頻率與貝殼內腔固有的頻率相同，則會發生共振，共振會把聲音放大。當我們把貝殼罩住耳朵後會形成一個共振腔，根據貝殼形狀大小不同會放大某些特定頻率的聲音，貝殼把耳朵周圍的聲波收集過來，在貝殼裡面產生共鳴，由於貝殼內的空氣振動起伏不定，所以這種共鳴聲音和海浪聲相似，人們便產生了美好的錯覺，以為那是大海的聲音
（資料來源: 貝殼裡為什麼會傳出海洋的聲音？“貝殼共振”了解一下-張起帆）
One can hear the “sounds of the ocean” in a shell because of resonance, and the phenomenon is called “seashell resonance”; one can simply summarize it as that the shell amplifies the “noises surrounding the ears”. Actually, in our daily lives, we have been surrounded by all kinds of noises: the sound of the wind around us, the buzzing of electronics, the sound of cars passing by, and more. All these sounds in our surroundings accumulate to form noises with regular frequency (white noise).
According to a physics principle, if vibration or a sound’s frequency outside a shell resembles the existing frequency inside the shell chamber, resonance will occur, and it will amplify the sound. As we cover our ear with a shell, a resonance chamber will be formed; depending on the shell's shape and size, sounds of certain frequencies will be amplified. As the shell collects all surrounding sound waves near the ear, resonance will be formed inside the shell. Since the air vibration inside a shell may rise or fall, the resonant sounds would resemble sounds of ocean waves; so people develop this wonderful illusion and believe that they are sounds of the ocean.