gc textbook chapter 12 Sound (id: a61ed520c)

本题目来源于试卷: gc textbook chapter 12 Sound，类别为 通用国际物理

[填空题]
A Doppler flow meter uses ult4gz7dd2pg ma kh571 kzrasound waves to measure blood-flow speeds. Supof+wi,r j+ht.g e1 1qdpose the device emits sound at 3.5 MHz, and the speed of qf j+e.dt ,ghw +1roi1sound in human tissue is taken to be 1540 m/s What is the expected beat frequency if blood is flowing in large leg arteries at 2 cm/s directly away from the sound source?   Hz

参考答案: 91±2%


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