A sound wave with a frequency of 13.9 kHz emerges through a circular opening that has a diameter of 0.200 m. Find the diffraction angle when the sound travels (a) in air and (b) in water. (Note: The speed of sound in air is 343 m/s and the speed of sound in water is 1482 m/s.) (a) Number (b) Number i Units Units

A sound wave with a frequency of 13.9 kHz emerges through a circular opening that has a diameter of 0.200 m. Find the diffraction angle when the sound travels (a) in air and (b) in water. (Note: The speed of sound in air is 343 m/s and the speed of sound in water is 1482 m/s.) (a) Number (b) Number i Units Units

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter17: Sound

Section: Chapter Questions

Problem 71P: Sound is more effectively transmitted into a stethoscope by direct contact rather than through the...

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Sound is more effectively transmitted into a stethoscope by direct contact rather than through the air, and it is further intensified by being concentrated on the smaller area of the eardrum. It is reasonable to assume that sound is transmitted into a stethoscope 100 times as effectively compared with transmission though the air. What, then, is the gain in decibels produced by a stethoscope that has a sound gathering area of 15.0 cm2, and concentrates the sound onto two eardrums with a total area of 0.900 cm2 with an efficiency of 40.0% ?
A riverside warehouse has several small doors facing the river. Two of these doors are open as shown in Figure P27.17. The walls of the warehouse are lined with sound-absorbing material. Two people stand at a distance L = 150 in from the wall with the open doors. Person A stands along a line passing through the midpoint between the open doors, and person B stands a distance y = 20 m to his side. A boat o the river sounds its horn. To person A, the sound is loud and clear. To person B, the sound is barely audible. The principal wavelength of the sound waves is 5.00 m. Assuming person B is at the position of the first minimum, determine the distance d between the doors, center to center.
ew Policies urrent Attempt in Progress A speaker has a diameter of 0.356 m. (a) Assuming that the speed of sound is 343 m/s, find the diffraction angle 0 for a 2.59-kHz tone. (b) What speaker diameter D should be used to generate a 6.06-kHz tone whose diffraction angle is as wide as that for the 2.59-kHz tone in part (a)? (a) Number Units (b) Number i Units eTextbook and Media Attempts: 0 of 3 used Submit Answer Save for Later
A speaker has a diameter of 0.35 m. (a) Assuming that the speed of sound is 343 m/s, find the diffraction angle e for a 2.0-kHz tone. 36.7
A laser light traveling in fiber optics glass with index of refraction of N=1.5 is amplified every 150km. What is the time it takes in milli-seconds, for this laser light to travel 150 km in this fiher optical glass?
high-frequency sound waves exhibit less diffraction than low-frequency sound waves do. However, even high frequency sound waves exhibit much more diffraction under normal circumstances than do light waves that pass through the same opening. The highest frequency that a healthy ear can typically hear is 2.0 × 104 Hz. Assume that a sound wave with this frequency travels at 344 m/s and passes through a doorway that has a width of 0.95 m. (a) Determine the angle that locates the first minimum to either side of the central maximum in the diffraction pattern for the sound. (b) Suppose that yellow light (wavelength = 567 nm, in vacuum) passes through a doorway and that the first dark fringe in its diffraction pattern is located at the angle determined in part (a). How wide would this hypothetical doorway have to be?
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Two radio antennas separated by d = 272 m as shown in the figure below simultaneously broadcast identical signals at the same wavelength. A car travels due north along a straight line at position x = 1150 m from the center point between the antennas, and its radio receives the signals. Note: Do not use the small-angle approximation in this problem. d (a) If the car is at the position of the second maximum after that at point O when it has traveled a distance y = 400 m northward, what is the wavelength of the signals? m (b) How much farther must the car travel from this position to encounter the next minimum in reception? m
Two identical audio speakers connected to the same amplifier produce in-phase sound waves with a single frequency that can be varied between 340 and 575 HzHz . The speed of sound is 340 m/sm/s . You find that where you are standing, you hear minimum-intensity sound If one of the speakers is moved 39.8 cmcm toward you, the sound you hear has maximum intensity. What is the frequency of the sound? Express your answer in hertz. How much closer to you from the position in part B must the speaker be moved to the next position where you hear maximum intensity? Express your answer in meters.
Sound exits a diffraction horn loudspeaker through a rectangular opening like a small doorway. Such a loudspeaker is mounted outside on a pole. In winter, when the temperature is 273 K, the diffraction angle θ has a value of 13o. What is the diffraction angle for the same sound on a summer day when the temperature is 311 K?