Answer :
The clarinet is the woodwind instrument that is designed as a closed tube. Among the listed woodwind instruments (recorder, clarinet, oboe, and flute), the clarinet stands out as the one that follows a closed tube model for sound production.
The recorder is a woodwind instrument that is modeled as a closed tube. It consists of a head joint, a body with finger holes, and a foot joint. When playing the recorder, the musician blows air into the instrument through the mouthpiece, which creates vibrations within the closed tube. These vibrations then travel through the tube and are manipulated by the opening and closing of the finger holes to produce different pitches.
Unlike open tube instruments like the flute, the recorder has a narrow cylindrical bore and a tapered mouthpiece, which effectively closes the tube. This design allows for the production of distinct pitches and tones. By covering and uncovering the finger holes, the musician can change the effective length of the closed tube, thereby altering the pitch of the instrument.
The closed tube design of the recorder is what enables it to produce a clear and distinct sound. The air column inside the closed tube acts as a resonator, reinforcing certain harmonics and producing the characteristic timbre of the instrument. The closed tube design also allows for the production of lower pitches compared to open tube instruments.
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