Chapter 2: Q77PP (page 543)
If the deepest structure you wish to image is from the transducer, what is the maximum number of pulses per second that can be emitted? (a) ; (b) ; (c) ; (d) .
Short Answer
The correct answer is (b) .
Chapter 2: Q77PP (page 543)
If the deepest structure you wish to image is from the transducer, what is the maximum number of pulses per second that can be emitted? (a) ; (b) ; (c) ; (d) .
The correct answer is (b) .
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Get started for freeA long tube contains air at a pressure of 1.00 atm and a temperature of 77.0°C. The tube is open at one end and closed at the other by a movable piston. A tuning fork that vibrates with a frequency of 500 Hz is placed near the open end. Resonance is produced when the piston is at distances 18.0 cm, 55.5 cm, and 93.0 cm from the open end. (a) From these values, what is the speed of sound in air at 77.0°C? (b) From the result of part (a), what is the value of g? (c) These results show that a displacement antinode is slightly outside the open end of the tube. How far outside is it?
Because the speed of ultrasound in bone is about twice the speed in soft tissue, the distance to a structure that lies beyond a bone can be measured incorrectly. If a beam passes through of tissue, then of bone, and then another of tissue before echoing off a cyst and returning to the transducer, what is the difference between the true distance to the cyst and the distance that is measured by assuming the speed is always ? Compared with the measured distance, the structure is actually
(a) farther
(b) farther
(c) closer
(d) closer
After a beam passes through of tissue, what is the beam’s intensity as a fraction of its initial intensity from the transducer?
(a); (b); (c); (d)
Consider a sound wave in air that has displacement amplitude 0.0200 mm. Calculate the pressure amplitude for frequencies of (a) 150 Hz; (b) 1500 Hz; (c) 15,000 Hz. In each case compare the result to the pain threshold, which is 30 Pa.
One end of a horizontal rope is attached to a prong of another end passes over a pulley and supports a 1.50-kg mass. The linear mass density of the rope is 0.0480 kg/m. (a) What is the speed of a transverse wave on the rope? (b) What is the wavelength? (c) How would you answer to parts (a) and (b) change if the mass were increased to 3.00 kg?
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