Expectant parents are thrilled to hear their unbornbabys heartbeat, revealed by an

Chapter 17, Problem 43

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Expectant parents are thrilled to hear their unbornbabys heartbeat, revealed by an ultrasonic detectorthat produces beeps of audible sound in synchronizationwith the fetal heartbeat. Suppose the fetuss ventricularwall moves in simple harmonic motion with anamplitude of 1.80 mm and a frequency of 115 beats perminute. (a) Find the maximum linear speed of the heartwall. Suppose a source mounted on the detector incontact with the mothers abdomen produces sound at2 000 000.0 Hz, which travels through tissue at 1.50 km/s.(b) Find the maximum change in frequency betweenthe sound that arrives at the wall of the babys heartand the sound emitted by the source. (c) Find themaximum change in frequency between the reflectedsound received by the detector and that emitted by thesource.

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