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THE SCIENCE AND APPLICATIONS OF ACOUSTICS - H. H. Arnold ...

THE SCIENCE AND APPLICATIONS OF ACOUSTICS - H. H. Arnold ...

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508 17. Commercial and Medical Ultrasound Applicationsbe 2550 m/s, and the deflection of the beam is 8.58 ◦ . Find the velocity of thefluid.5. We can also measure the velocity of sound in a fluid by the beam-deflectionmethod. It is known that a gas is passing through a conduit at the rate of120 m/s. The deflection was measured to be 0.056 radian. Estimate the speedof sound in the gas.6. Two transducers are set apart 21.2 cm in a nondispersive medium. The tworesonance frequencies are 2164 Hz and 4617 Hz. Find the sound propagationspeed of the medium.7. How could motion sensing be useful in a home garage? Where else in a homewould you use a sensor?8. Why is ultrasound considered to be safer than X-rays? Would you expect theultrasound equipment to be more expensive or cheaper than X-ray gear?9. Why is it preferable to use ultrasound to examine the fetus in the womb toX-rays? How would the images compare in quality?10. What is the principal difference between high-intensity and low-intensity ultrasoundas used in the human body or on a live animal?11. What are the two primary factors in controlling ultrasound dosage?

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