Final answer:
The woodwind instrument in question is likely a flute or an oboe, which are played by varying the length of the resonance column through finger holes. These instruments amplify sound using the principle of resonance in air columns.
Step-by-step explanation:
The instrument described, held crosswise and producing sound by blowing across a hole, is a member of the woodwind family. Instruments like the flute or oboe are notable woodwinds where players vary the tube's length by opening and closing finger holes, which in turn, changes the pitch of the notes produced. In the case of the oboe, air is forced through a tiny opening between two reeds, as depicted in Figure 16.3.3. Woodwind instruments, in general, use the principle of resonance in air columns to amplify sound, with different instruments using various methods to adjust the length of the resonating air column.
Different wind instruments have tubes with either symmetrical boundary conditions, such as being open at both ends, or anti-symmetrical boundary conditions, like being closed at one end. When players interact with these instruments, such as using a sliding bar on a trombone or varying the pressure and coverage of finger holes on flutes and oboes, they are essentially manipulating these boundary conditions to create their desired sounds.
Other instruments, such as string instruments or the marimba, also rely on resonance to amplify sound. However, they do so in different ways – for instance, the marimba uses pots or gourds to amplify the tones of its wooden slats, and its resonance can be modified by adding water, whereas string instruments use the resonance of a sounding box.