Why Can You Hear The Ocean In A Shell
Olivia Luz
The seashell that you are holding just slightly above your ear captures this noise which resonates inside the shell.
As lovely as that. Given time your brain would habituate to this new background mix and you d stop hearing that too. The answer is that you are hearing the local noises already around you but altered by the shell thanks to some clever physics. Shells then happen to be incredible amplifiers on that noise.
In a soundproof room there is still air but when you hold the seashell to your ear there s no sound. The most likely explanation for the wave like noise is ambient noise from around you. This occurs because air bounces within the shell and makes sound which varies in pitch depending on the size of the shell. Some will enter the seashell and bounce around that s called resonance.
Shells sound like the ocean because the curved shape of a seashell amplifies the ambient noise or background noise that normally is too quiet to be heard. The sound is heard because ocean movements are similar to airflow. The resonance is made possible by the shell s hard inner walls which are curved on which the noise bounces off. But when you put a shell or any other resonating chamber over your ear some frequencies get amplified and others get suppressed.
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A small seashell might produce a higher pitched more ocean like. So what are you actually hearing in the shell. Because it is ubiquitous our brains filter it out and we don t normally hear it. The resonance in turn produces the ocean sound.
Sound waves come in lots of different shapes and sizes. Whether you hold a seashell or the mouth of an empty bowl which is not related to an ocean in any way around your ear you experience the ocean like sound quality as a result of a phenomenon called resonance.
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