Q: If the deepest structure you wish to image is 10.0
If the deepest structure you wish to image is 10.0 cm from the transducer, what is the maximum number of pulses per second that can be emitted? (a). 3850; (b). 7700; (c). 15,400; (d). 1,000,000.
See AnswerQ: After a beam passes through 10 cm of tissue, what is
After a beam passes through 10 cm of tissue, what is the beam’s intensity as a fraction of its initial intensity from the transducer? (a). 1 × 10-11; (b). 0.001; (c). 0.01; (d). 0.1.
See AnswerQ: Because the speed of ultrasound in bone is about twice the speed
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 4 cm of tissu...
See AnswerQ: In some applications of ultrasound, such as its use on cranial
In some applications of ultrasound, such as its use on cranial tissues, large reflections from the surrounding bones can produce standing waves. This is of concern because the large pressure amplitude...
See AnswerQ: A brass rod is 185 cm long and 1.60 cm
A brass rod is 185 cm long and 1.60 cm in diameter. What force must be applied to each end of the rod to prevent it from contracting when it is cooled from 120.0° C to 10.0° C?
See AnswerQ: For cranial ultrasound, why is it advantageous to use frequencies in
For cranial ultrasound, why is it advantageous to use frequencies in the kHZ range rather than the MHz range? (a). The antinodes of the standing waves will be closer together at the lower frequencies...
See AnswerQ: What is one reason the noble gases are preferable to air (
What is one reason the noble gases are preferable to air (which is mostly nitrogen and oxygen) as an insulating material? (a). Noble gases are monatomic, so no rotational modes contribute to their mol...
See AnswerQ: You place 35 g of this cryoprotectant at 22°C in
You place 35 g of this cryoprotectant at 22°C in contact with a cold plate that is maintained at the boiling temperature of liquid nitrogen (77 K). The cryoprotectant is thermally insulated from every...
See AnswerQ: Careful measurements show that the specific heat of the solid phase depends
Careful measurements show that the specific heat of the solid phase depends on temperature (Fig. P17.117). How will the actual time needed for this cryoprotectant to come to equilibrium with the cold...
See AnswerQ: In another experiment, you place a layer of this cryoprotectant between
In another experiment, you place a layer of this cryoprotectant between one 10 cm × 10 cm cold plate maintained at -40° C and a second cold plate of the same size maintained at liquid nitrogen’s boili...
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