What are 2 characteristics of a Shallow focus?

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Multiple Choice

What are 2 characteristics of a Shallow focus?

Explanation:
Shallow focus is controlled by the transducer’s aperture size and the wavelength of the sound. The near-field length, where the beam is still converging, is roughly proportional to D^2/λ (D = aperture diameter, λ = wavelength). To achieve a focus closer to the transducer, you want a smaller aperture and a longer wavelength (lower frequency), which shorten the near-field length. In other words, a smaller diameter PZT together with a lower frequency (larger λ) produces a shallower focus.

Shallow focus is controlled by the transducer’s aperture size and the wavelength of the sound. The near-field length, where the beam is still converging, is roughly proportional to D^2/λ (D = aperture diameter, λ = wavelength). To achieve a focus closer to the transducer, you want a smaller aperture and a longer wavelength (lower frequency), which shorten the near-field length. In other words, a smaller diameter PZT together with a lower frequency (larger λ) produces a shallower focus.

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