An ultrasound unit is being used to measure a patients, Physics

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An ultrasound unit is being used to measure a patients

An ultrasound unit is being used to measure a patient's heartbeat by combining the emitted 2.0 MHz signal with the sound waves reflected from the moving tissue of one point on the heart. The beat frequency between the two signals has a maximum value of 520 Hz. What is the maximum speed of the heart tissue? Assume that vsound=1540 m/s in blood.

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