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Find the near-field to far-field transition distance (ZR) each of the unfocused transducers listed below: (a)...

Find the near-field to far-field transition distance (ZR) each of the unfocused transducers listed below: (a) Diameter = 1 cm, frequency = 1 MHz (b) Diameter = 3 cm, frequency = 1 MHz (c) Diameter = 1 cm, frequency = 2.25 MHz

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