Why does a seashell make the sound of the ocean?

چرا صدف‌ دریایی صدای اقیانوس می‌دهد؟

A warm and sunny beach, moist sand and hearing the sound of the sea from the heart of an oyster, these are the images that are part of many people’s childhood memories. In fact, you can hardly find a person who has not had such an experience or has not listened to the sound of a sea shell, however, what is the reason for this sound? Are we really hearing sounds trapped in oysters, or is there a simpler explanation?

According to Professor Trevor Cox, an acoustic engineer at the University of Salford in the United Kingdom, the sounds emitted by oysters are not the sounds of the sea, so if the sounds we hear are not the sounds of the sea, then where are they coming from?

“Andrew King,” head of the Center for Integrative Neuroscience from the University of Oxford, said in response to this question that the said voice is actually Environmental sounds And background are that their range is enhanced by the physical characteristics of seashells.

He further explains that the hard and curved surfaces inside the oyster reflect the sound waves and somehow cause these waves inside the oyster to undergo “jumpbecome The seashell further acts as an amplifier, amplifying certain audio frequencies, making certain sounds sound louder even without the seashell being next to the ear.

It should be mentioned that the hearing frequency in the oyster depends on its size and shape, and according to King, if the sea oyster has an unusual shape, it will probably amplify several frequencies.

The importance of environmental background sound in the formation of seashell sounds

According to Cox, the seashell actually behaves like a wind instrument because the resonant frequencies in it cause the air inside the shell to vibrate strongly, and our brains also pay attention to this frequency change.

According to Cox and King, you don’t even need the oyster itself to hear the said sound, and you can make these sounds using a Cup Or BowlSimulate at home.

The reasons for hearing the sound of the ocean from sea shells

It should be said that if there is Environmental soundsPlacing these objects next to the ear can lead to the repetition of the said experience, King says that it is possible to do this to some extent even by folding and rounding the hand, although he still emphasizes that the said sound depends on the size and shape of the desired object. .

This is such that the background sound of the environment must be present and otherwise, if the mentioned simple test in a Anechoic room takes place, no sound will be heard, either in a shell or in a bowl.

Anechoic rooms or enclosures are places specially designed to achieve absolute silence Designed for scientific experiments. These rooms are so quiet that after spending some time in them, people will not only hear their hearts beating and their bones rattling, but they may also end up losing their balance due to the absolute lack of “resonance” in their surroundings. to give

The reasons for hearing the sound of the ocean from oysters
An example of an anechoic room

In such a situation where there are no external ambient and background sounds, it will be impossible to hear the sounds of sea shells or similar frequencies. Therefore, it can be concluded that the sounds heard from sea shells are the amplified environmental sounds.

By the same reasoning, if you bring a shell close to your ear, you are actually receiving the background sound of the sea, which is amplified by the physical shape of the shell, in the same way, if you listen to the sound of a shell at home You are the amplified ambient sound of your home.

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