As sound travels, which property of the beam changes?

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Multiple Choice

As sound travels, which property of the beam changes?

Explanation:
As sound travels, the beam spreads out due to diffraction from the finite size of the transducer. This spreading makes the cross-sectional width—the lateral dimension—increase with depth. In other words, the beam becomes wider as it propagates, which is why width is the property that changes. The other dimensions—height or depth—are not the primary way the beam changes as it moves, and the beam’s angle would require focusing or refraction to vary noticeably.

As sound travels, the beam spreads out due to diffraction from the finite size of the transducer. This spreading makes the cross-sectional width—the lateral dimension—increase with depth. In other words, the beam becomes wider as it propagates, which is why width is the property that changes. The other dimensions—height or depth—are not the primary way the beam changes as it moves, and the beam’s angle would require focusing or refraction to vary noticeably.

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