A doctor using 3MHz ultrasound measures a 6500 Hz frequency shift as the ultrasound reflects from blood ejected from the heart through the aorta. Assuming that blood inside the heart is essentially at rest and the patient is lying down, what is the difference in blood pressure between the inside of the heart and the aorta? Treat blood as an ideal fluid. The speed of sound in tissue is 1540 m/s.

  

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