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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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
Transcribed Image Text:Q) If the velocity of blood flow in the
aorta is about (0.32 m/s),
pulse frequency would you expect if
a (4.3 MHz) simeq ultrasound was
directed along the blood flow and
the waves were reflected from the
red blood cells? Assume that waves
travel at a speed of (1.54*10^3 m/s)
what
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- A geological disturbance in San Andreas fault generated a seismic wave that was detected in Phoenix, AZ, approximately 1000 km from the epicenter. If such waves travel at an average speed of 6.5 km/s, what would be the time-lag between the disturbance and the detection? How does this speed compare with that of sound waves in air at a day temperature of 23°C? 2.6 min, vseismic/ Vsound 19 O 2.6 min, vseismie/ Vsound 26 O 2.9 min, vseismie/ Vsound 29 O 3.2 min, vseismic/ Vsound 21arrow_forwardHigh-intensity focused ultrasound (HIFU) is one treatment for certain types of cancer. During the procedure, a narrow beam of high-intensity ultrasound is focused on the tumor, raising its temperature to nearly 90 °C and killing it. A range of frequencies and intensities can be used, but in one treatment a beam of frequency 3.10 MHz produced an intensity of 1425.0 W/cm². The energy was delivered in short pulses for a total time of 2.60 s over an area measuring 1.20 mm by 5.30 mm. The speed of sound in the soft tissue was 1570 m/s, and the density of that tissue was 1492.0 kg/m³. What was the wavelength of the ultrasound beam? How much energy Etotal was delivered to the tissue during the 2.60 s treatment? What was the maximum displacement A of the molecules in the tissue as the beam passed through? λ = Etotal A = = 5.06 X10-4 5.8 ×10¹2 Incorrect 3.15 x10-7 Incorrect m marrow_forwardTwo progressive waves yj = A sin( 4 x - ot) and y2 = A sin( 2" x – ot – 5) travel in the same direction. Calculate the velocity of the wave produced as a result of interference of these two waves. Take A = 5 cm, 1 =8.7 m and w =12.7 rad/s (radian per second). Give your answer in Sl units.arrow_forward
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