Sound or roar from the sea shell

In our childhood days we would love to hear the sound of the waves in the ocean. We weren't much concerned about how it happens.

First common explanation among people is that, it is the sound of the ocean waves. Next common explanation is that, they are echoes of blood rushing through your ears. Some say, it is due to the air rushing in and out of the shell.

But the sound could be heard, even if you are near or far away from the ocean. If it is due to blood vessels, it should be higher in intensity when the blood flow is high, like soon after exercising. Above all, you won't be able to hear the sound in the sound proof room. Even though air is there in sound proof room, we are not able to hear it. So the above three explanations/theories are wrong.

Most obvious reason for the wave sound in the sea shell would be, the presence of ambient noise which is amplified in the sea shell. How is the noise amplified? It is because of resonance. ( Resonance - a vibration of large amplitude produced by a relatively small vibration near the same frequency of vibration as the natural frequency of the resonating system). The most common example to explain resonance is that of the march of an army of soldiers over a bridge. If the army is large enough, and if they made a rhythmic marching it could very well make the bridge unstable or collapse. This is one of the reasons for the soldiers to "break step"

The shell is the resonating chamber, and noise from the external of the shell, when it gets inside, is resonated in the interior of the shell creating audible sound. You could very well hear similar sound from a empty cup or may be with your hands. The sound may vary depending on the distance of the cup and the angle.


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