In ultrasound,waves are produced by

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(B) Ultrasound imaging utilizes high-frequency sound waves to create images of internal body structures.These waves are generated using a transducer t

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Piezoelectric effect

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(B) Ultrasound imaging utilizes high-frequency sound waves to create images of internal body structures.These waves are generated using a transducer that contains crystals exhibiting the $Piezoelectric$ $effect$.When an alternating electric current is applied to these crystals,they vibrate rapidly,producing high-frequency sound waves (ultrasound).Therefore,the correct option is $B$.

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