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Consider a focused 1-cm-diameter transducer with 50% bandwidth in water. Its focal length is 2 cm. Along the transducer axis, there are two point scatters

Consider a focused 1-cm-diameter transducer with 50% bandwidth in water. Its focal length is 2 cm. Along the transducer axis, there are two point scatters separated by 0.25 mm axially. Find the minimal central frequency of the transducer so that two scatters will appear in the ultrasound image?

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