If the transducer diameter increases while keeping frequency constant, what happens to the focal depth?

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Multiple Choice

If the transducer diameter increases while keeping frequency constant, what happens to the focal depth?

Explanation:
Focal depth is set by the aperture size and the wavelength. With a fixed frequency, the wavelength is fixed, so changing the transducer diameter directly shifts where the beam comes to its tightest focus. A larger diameter acts like a bigger focusing element, and the focal length scales roughly with D^2/λ. Since λ is constant, increasing D pushes the focus farther from the transducer, making the focal depth deeper.

Focal depth is set by the aperture size and the wavelength. With a fixed frequency, the wavelength is fixed, so changing the transducer diameter directly shifts where the beam comes to its tightest focus. A larger diameter acts like a bigger focusing element, and the focal length scales roughly with D^2/λ. Since λ is constant, increasing D pushes the focus farther from the transducer, making the focal depth deeper.

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