The beam gradually _____ within the near zone.

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Multiple Choice

The beam gradually _____ within the near zone.

Explanation:
In the near field of a focused beam, the waves are converging toward the focal point. As you move away from the transducer toward that focus, the cross-sectional area where the energy is concentrated gets smaller, so the beam narrows. This narrowing continues until you reach the focus, where the beam is at its smallest width. Beyond the focus, the beam then spreads out again, so it diverges in the far field. So the correct idea is that the beam gradually narrows within the near zone.

In the near field of a focused beam, the waves are converging toward the focal point. As you move away from the transducer toward that focus, the cross-sectional area where the energy is concentrated gets smaller, so the beam narrows. This narrowing continues until you reach the focus, where the beam is at its smallest width. Beyond the focus, the beam then spreads out again, so it diverges in the far field. So the correct idea is that the beam gradually narrows within the near zone.

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