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The sound of the fluttering sound when the ear is shoved into the shell

You are actually hearing the noise around, but have been modified based on some of the principles of physics.

When the lips are blowing through the empty bottle mouth, you will hear the sound echoed from inside the bottle. And for the scientists, that sound was pitched in a musical note, and the bottle was called a "cavity".

Go back to the pile of shells. All types of shell are concave shape, small and unusual, so the sound will reflect on different frequencies.

Put a large shell or shell in your ear, you will hear the calm sound of the sea. However, the vast ocean can not get into that tiny shell. So what sound?.

To prove, the experts conducted research in a rather noisy room. They put a cup near the ear (because the structure inside the cup is much simpler than the shells) and attach a very small microphone just behind the eardrum.

The microphone recorded a 15dB sound at the resonance frequency of 648 Hz. And at twice the frequency (1296 Hz), the sound heard is 16dB.

However, in order for the shells to make a sound, the surrounding environment must have a sound.

If you go into a soundproof room and place the shells on your ears, you will not hear anything. The resonance sounds fall into the shell and accidentally sound like waves.

In addition, the human brain is excellent in imagining. We can see the animals gliding over the clouds, imagining the face of the Lord Jessus appearing in a piece of potato, even Mary on the sandwich. The sound in the shell is no exception, because people think it is like the wave only.

Besides, we are exposed to a lot of sounds every day, but most do not mind. Only when you apply the ear to the shells, the sounds are focused and you hear them.