SHELL'S AN AMPLIFIER

WHY CAN WE HEAR A NOISE LIKE WAVES IN A SEA SHELL??



The pretty idea in this question is just a poet’s fancy, and nothing more. For the truth is that we only imagine a likeness between the sound of the shell and the sound of the sea.  Really the shell is one of those things which can pick up and make stringer certain kinds of sounds.
The wooden part of a fiddle does this; if you take it away and play on the strings without it they make a feeble, thin, unpleasant tone. The things that make sound resound are called resonators. This resonators work on the principle that when an object is made to vibrate with a frequency same as that theirs they vibrate with higher amplitude. This applied frequency is called as resonant frequency.
What the shell picks up are the very slight sound going all about us. It is never really quite quiet, and the shells picks up sound so slight that we do not hear them  at all without shell.  The shell is only a telephone, and if no sound comes to it it is silent, and can give nothing out.
Thus a shell plays a role of amplifier.





(source:TBOK v7 4759(A))

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