The region from the transducer to the focus is known as the

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Multiple Choice

The region from the transducer to the focus is known as the

Explanation:
From the transducer up to the point where the beam reaches its focus, the wavefronts are still curved and interference among waves from different parts of the transducer shapes the beam. This region is known as the near field, also called the Fresnel zone. The boundary between the near field and the far field is roughly at a distance determined by the transducer diameter and the wavelength, but the key idea is that up to the focus the beam is not yet a simple, plane-front beam. Since the focus lies within this initial, curved-beam region, the region from the transducer to the focus is the near zone.

From the transducer up to the point where the beam reaches its focus, the wavefronts are still curved and interference among waves from different parts of the transducer shapes the beam. This region is known as the near field, also called the Fresnel zone. The boundary between the near field and the far field is roughly at a distance determined by the transducer diameter and the wavelength, but the key idea is that up to the focus the beam is not yet a simple, plane-front beam. Since the focus lies within this initial, curved-beam region, the region from the transducer to the focus is the near zone.

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