Principles of Physics: A Calculus-Based Text
5th Edition
ISBN: 9781133104261
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 13, Problem 4CQ
To determine
Explain whether the focus of old sound using auto focus cameras is influenced by temperature of air or not.
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An automatic focus camera is able to focus on objects by use of an ultrasonic sound wave. The camera sends out sound waves that reflect off distant objects and return to the camera. A sensor detects the time it takes for the waves to return and then determines the distance an object is from the camera. The camera lens then focuses at that distance. Now that's a smart camera! In a subsequent life, you might have to be a camera; so try this problem for practice:
If a sound wave (speed = 340 m/s) returns to the camera 0.150 seconds after leaving the camera, then how far away is the object?
The back wall of an auditorium is 26.0 m from the stage. If you are seated in the middle row, how much time elapses between a sound from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall?
An automatic focus camera is able to focus objects using ultrasonic sound waves.The camera sends out sound waves that reflect ff distance objects and returns to the camera. A sensor detects the time it takes for the waves to return and then determines the distance of an objects from the camera. Id a sound wave with a speed of 340m/s returns to the camera after 0.150 sec, how far away is the object?
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Chapter 13 Solutions
Principles of Physics: A Calculus-Based Text
Ch. 13.1 - (i) In a long line of people waiting to buy...Ch. 13.2 - Prob. 13.2QQCh. 13.2 - The amplitude of a wave is doubled, with no other...Ch. 13.3 - Suppose you create a pulse by moving the free end...Ch. 13.5 - Prob. 13.5QQCh. 13.7 - Consider detectors of water waves at three...Ch. 13.7 - Prob. 13.7QQCh. 13 - Prob. 1OQCh. 13 - Prob. 2OQCh. 13 - Rank the waves represented by the following...
Ch. 13 - Prob. 4OQCh. 13 - When all the strings on a guitar (Fig. OQ13.5) are...Ch. 13 - By what factor would you have to multiply the...Ch. 13 - A sound wave can be characterized as (a) a...Ch. 13 - Prob. 8OQCh. 13 - Prob. 9OQCh. 13 - A source vibrating at constant frequency generates...Ch. 13 - A source of sound vibrates with constant...Ch. 13 - Prob. 12OQCh. 13 - Prob. 13OQCh. 13 - Prob. 14OQCh. 13 - As you travel down the highway in your car, an...Ch. 13 - Prob. 16OQCh. 13 - Suppose an observer and a source of sound are both...Ch. 13 - Prob. 1CQCh. 13 - Prob. 2CQCh. 13 - Prob. 3CQCh. 13 - Prob. 4CQCh. 13 - When a pulse travels on a taut string, does it...Ch. 13 - Prob. 6CQCh. 13 - Prob. 7CQCh. 13 - Prob. 8CQCh. 13 - Prob. 9CQCh. 13 - Prob. 10CQCh. 13 - Prob. 11CQCh. 13 - How can an object move with respect to an observer...Ch. 13 - Prob. 13CQCh. 13 - Prob. 1PCh. 13 - Prob. 2PCh. 13 - Prob. 3PCh. 13 - Prob. 4PCh. 13 - The string shown in Figure P13.5 is driven at a...Ch. 13 - Prob. 6PCh. 13 - Prob. 7PCh. 13 - Prob. 8PCh. 13 - Prob. 9PCh. 13 - A transverse wave on a string is described by the...Ch. 13 - Prob. 11PCh. 13 - Prob. 12PCh. 13 - Prob. 13PCh. 13 - A transverse sinusoidal wave on a string has a...Ch. 13 - A steel wire of length 30.0 m and a copper wire of...Ch. 13 - Prob. 16PCh. 13 - Prob. 17PCh. 13 - Review. A light string with a mass per unit length...Ch. 13 - Prob. 19PCh. 13 - Prob. 20PCh. 13 - A series of pulses, each of amplitude 0.150 m, are...Ch. 13 - Prob. 22PCh. 13 - Prob. 23PCh. 13 - A taut rope has a mass of 0.180 kg and a length of...Ch. 13 - Prob. 25PCh. 13 - Prob. 26PCh. 13 - Prob. 27PCh. 13 - Prob. 28PCh. 13 - Prob. 29PCh. 13 - Prob. 30PCh. 13 - Write an expression that describes the pressure...Ch. 13 - Prob. 32PCh. 13 - Prob. 33PCh. 13 - Prob. 34PCh. 13 - Prob. 35PCh. 13 - Prob. 36PCh. 13 - A sound wave in air has a pressure amplitude equal...Ch. 13 - A rescue plane flies horizontally at a constant...Ch. 13 - A driver travels northbound on a highway at a...Ch. 13 - Prob. 40PCh. 13 - Prob. 41PCh. 13 - Prob. 42PCh. 13 - Prob. 43PCh. 13 - Prob. 44PCh. 13 - Review. A tuning fork vibrating at 512 Hz falls...Ch. 13 - Submarine A travels horizontally at 11.0 m/s...Ch. 13 - Prob. 47PCh. 13 - Prob. 48PCh. 13 - Prob. 49PCh. 13 - Review. A block of mass M, supported by a string,...Ch. 13 - Prob. 51PCh. 13 - Review. A block of mass M hangs from a rubber...Ch. 13 - Prob. 53PCh. 13 - The wave is a particular type of pulse that can...Ch. 13 - Prob. 55PCh. 13 - Prob. 56PCh. 13 - Prob. 57PCh. 13 - Prob. 58PCh. 13 - Prob. 59PCh. 13 - Prob. 60PCh. 13 - Prob. 61PCh. 13 - Prob. 62PCh. 13 - Prob. 63PCh. 13 - Prob. 64PCh. 13 - Prob. 65PCh. 13 - Prob. 66PCh. 13 - Prob. 67PCh. 13 - A sound wave moves down a cylinder as in Active...Ch. 13 - A string on a musical instrument is held under...Ch. 13 - A train whistle (f = 400 Hz) sounds higher or...Ch. 13 - The Doppler equation presented in the text is...
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- An ultrasound imaging system is used to create a B-mode image of a soft-tissue sample. We want an image that extends to a depth of 30 cm from the transducer. Assume that 175 A-mode lines are used to create the B-mode image. a) How much time is required to acquire the data for each A-mode line? b) What is the maximum possible B-mode image refresh rate, in frames per second? c) Using the same refresh rate calculated above, what is the maximum depth possible if all A-mode lines are acquired simultaneously?arrow_forwardA sonar device emits waves of frequency 40 kHz. The wavelength of the wave in water is 0.032 m. Suppose thatthe device is fixed to the bottom of the ship. It emits a signal and the echo from the ocean bed returns 0.8 secondlater. What is the depth of the ocean at that point?arrow_forward(a) What is the speed of sound in a medium where a 100-kHz frequency produces a 5.96-cm wavelength? (b) Which substance in the table shown is this likely to be?arrow_forward
- A certain instant camera determines the dis- tance to the subject by sending out a sound wave and measuring the time needed for the wave echo to return to the camera. How long would it take the sound wave to return to the camera if the subject were 2.07 m away? The speed of sound is 343 m/s. Answer in units of s.arrow_forwardA student standing in a canyon yells "echo" and her voice produces a sound wave of the frequency of f=0.54 kHz. The echo takes t=4.8s to return to the student. Assume the speed of sound through the atmosphere at this location is v=328 m/s a) what is the wavelength of the soundwave in meters? b) input the expression for the distance, d, the canyon wall is from the student. (answer should look like 'd='"arrow_forwardDolphins can use sonar to detect objects in the sea. How far away is the object from the dolphin if the sonar takes .02 sec to be returned? Sound travels at 1484 m/s in sea water. 60 m 30 m 15 m 7.5 marrow_forward
- A physicist at a fireworks display times the lag between seeing an explosion and hearing its sound, and finds it to be 0.371 s. How far away in meters is the explosion if air temperature is 24.0°C and if you neglect the time taken for light to reach the physicist? Assume the speed of sound in 0°C air is 331 m/s. Type your answer.....arrow_forwardDetermine the minimum distance from the bank that the fisherman (see figure) stands in order that the fish isn't alerted to his presence by hearing his voice travelling through air and then water. Take the man's mouth to be 1.7 m above the ground, take the ground to be at the same level as the water surface, take the speed of sound in air to be 343 m/s and take the speed of sound in this water to be 1430 m/s. 12. punos O 6.8 m O 0.48 m O7.4 m O0.42 m O4.1 m 04.0 marrow_forwardTwo in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 5.00 m. A person is standing 12.0 m away from the wall, equidistant from the loudspeakers. When the person moves 1.00 m parallel to the wall, she experiencesdestructive interference for the first time. What is the frequency of the sound? The speed of sound in air is 343 m/s.arrow_forward
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