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like an open-open pipe if the mallet is quickly removed after striking the pipe's extreme. Also, it may sound as an open-closed pipe, if the mallet remains closing the pipe after the attack. In the first situation (open-open), the first resonance mode will have a wavelength that corresponds to two times the pipe length, approximately. It is called by acousticians as a "half-wavelength" air column. In the second situation (open-closed), the first resonance mode will have a wavelength that corresponds to four times the pipe length, approximately.

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