In convex sequential arrays ________ of the crystals are fired simultaneously to create a single sound beam.

• A. Some but not all
• B. All
• C. None
• D. Most

Answer: (A)

In convex sequential arrays, the beam is formed by firing small groups of adjacent crystals simultaneously, then moving to the next group in sequence to create a single, coherent sound beam. At any instant, only a subset of the crystals is active, so some but not all hardware elements fire together. This group-by-group firing establishes the curved beam path and allows the beam to be scanned and focused across the image. If all crystals fired at once, you’d lose the controlled sequential formation and steering that this design uses, so the correct statement is that some but not all of the crystals are fired simultaneously.