Larger transducer diameters produce a beam with _____ divergence.

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Multiple Choice

Larger transducer diameters produce a beam with _____ divergence.

Explanation:
Beam divergence is set by diffraction at the transducer’s aperture. A larger aperture acts like a finer opening, producing energy that spreads into a narrower cone as it travels. For a circular transducer, the divergence angle is roughly proportional to the wavelength divided by the diameter, so at a fixed frequency, increasing the diameter reduces the beam’s angular spread. This means the beam stays narrower over distance (and the near field extends longer). So, larger transducer diameters produce a beam with less divergence.

Beam divergence is set by diffraction at the transducer’s aperture. A larger aperture acts like a finer opening, producing energy that spreads into a narrower cone as it travels. For a circular transducer, the divergence angle is roughly proportional to the wavelength divided by the diameter, so at a fixed frequency, increasing the diameter reduces the beam’s angular spread. This means the beam stays narrower over distance (and the near field extends longer). So, larger transducer diameters produce a beam with less divergence.

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