Q19) If the velocity of blood flow in the aorta is (0.32) m/s, what is the pulse frequency you would expect if ultrasound waves of frequency (43 MH2) were directed al ong the blood flow and the waves were reflected from red blood cells? Assume that waves travel at a speed of (m/s 103x1.54) O 0.178KHZ O 178.80HZ O 17.88KHZ O 1.788KHZ O 17.880HZ

Q19) If the velocity of blood flow in the aorta is (0.32) m/s, what is the pulse frequency you would expect if ultrasound waves of frequency (43 MH2) were directed al ong the blood flow and the waves were reflected from red blood cells? Assume that waves travel at a speed of (m/s 103x1.54) O 0.178KHZ O 178.80HZ O 17.88KHZ O 1.788KHZ O 17.880HZ

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter17: Sound Waves

Section: Chapter Questions

Problem 17.7P: A dolphin (Fig. P17.7) in seawater at a temperature of 25C emits a sound wave directed toward the...

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A sound wave moves down a cylinder as in Figure 16.17. Show that the pressure variation of the wave is described by P=smax2s2, where s = s(x, t) is given by Equation 16.28.
A dolphin (Fig. P17.7) in seawater at a temperature of 25C emits a sound wave directed toward the ocean floor 150 m below. How much time passes before it hears an echo?
The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound intensity level goes up by 40.0 dB?
The area of a typical eardrum is about 5.00 X 10-5 m2. (a) (Calculate the average sound power incident on an eardrum at the threshold of pain, which corresponds to an intensity of 1.00 W/m2. (b) How much energy is transferred to the eardrum exposed to this sound lor 1.00 mill?
A sound wave moves down a cylinder as in Active Figure 13.19. Show that the pressure variation of the wave is described by P=smax2s2, where s = s(x, t) is given by Equation 13.25.
What frequencies will a 1.80-m—long tube produce in the audible range at 20.0°C if: (a) The tube is closed at one end? (b) It is open at both end?
An interstate highway has been built through a neighborhood in a city. In the afternoon, the sound level in an apartment in the neighborhood is 80.0 dB as 100 cars pass outside the window every minute. Late at night, the traffic flow is only five cars per minute. What is the average late-night sound level?
The speed of a one-dimensional compressional wave traveling along a thin copper rod is 3.56 ktn/s. The rod is given a sharp hammer blow at one end. A listener at the far end of the rod hears the sound twice, transmitted through the metal and through air, with a time interval t between the two pulses, (a) Which sound arrives first? (b) Find the length of the rod as a function of t, (c) Find the length of the rod if t = 127 ms. (d) Imagine that the copper rod is replaced by another material through which the speed of sound is r. What is the length of the rod in terms of t and r? (e) Would the answer to part (d) go to a well-defined limit as the speed of sound in the rod goes to infinity? Explain your answer.
On a marimba (Fig. P18.75), the wooden bar that sounds a tone when struck vibrates in a transverse standing wave having three ant modes and two nodes. The lowest-frequency note is 87.0 Hz, produced by a bar 40.0 cm long, (a) Find the speed of transverse waves on the bar. (b) A resonant pipe suspended vertically below the center of the bar enhances the loudness of the emitted sound. If the pipe is open at the top end only, what length of the pipe is required to resonate with the bar in part (a)?
A siren mounted 011 the roof of a firehouse emits sound at a frequency of 900 Hz. A steady wind is blowing with a speed of 15.0 m/s. Taking the speed of sound in calm air to be 343 m/s. find the wavelength of the sound (a) upwind of the siren and (b) downwind of the siren. Firefighters are approaching the siren from various directions at 15.0 m/s. What frequency does a firefighter hear (c) if she is approaching from an upwind position so that site is moving in the direction in which the wind is blowing and (d) if she is approaching from a downwind position and moving against the wind?
A Girl Scout is taking a 10.00-km hike to earn a merit badge. While on the hike, she sees a cliff some distance away. She wishes to estimate the time required to walk to the cliff. She knows that the speed of sound is approximately 343 meters per second. She yells and finds that the echo returns after approximately 2.00 seconds. If she can hike 1.00 km in 10 minutes, how long would it take her to reach the cliff?