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.

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.

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 72P: Loudspeakers can produce intense sounds with surprisingly small energy input in spite of their low...

See similar textbooks

Similar questions

Your ear is capable of differentiating sounds that arrive at each ear just 0.34 ms apart, which is useful in determining where low frequency sound is originating from. (a) Suppose a low-frequency sound source is placed to the right of a person, whose ears are approximately 18 cm apart, and the speed of sound generated is 340 m/s. How long is the interval between when the sound arrives at the right ear and the sound arrives at the left ear? (b) Assume the same person was scuba diving and a low-frequency sound source was to the right of the scuba diver. How long is the interval between when the sound arrives at the right ear and the sound arrives at the left ear, if the speed of sound in water is 1500 m/s? (c) What is significant about the time interval of the two situations?
Loudspeakers can produce intense sounds with surprisingly small energy input in spite of their low efficiencies. Calculate the power input needed to produce a 90.0-dB sound intensity level for a 12.0-cm-diameter speaker that has an efficiency of 1.00% . (This value is the sound intensity level right at the speaker.)
The auditory canal of the human ear extends about 2.5 cm from the outer ear to the eardrum.a) Explain why the human ear is especially sensitive to sounds with frequencies close to 3500 Hz. Use v = 344m / s. b) Would you expect the ear to be especially sensitive to frequencies near 7000 Hz?At 10,500 Hz? Why?
Two microwave signals of nearly equal wavelengths can generate a beat frequency if both are directed onto the same microwave detector. In an experiment, the beat frequency is 110 MHz. One microwave generator is set to emit microwaves with a wavelength of 1.500 cm. If the second generator emits the longer wavelength, what is that wavelength? Express your answer to four significant figures and include the appropriate units.
Write your understanding about coherent waves. A steel wire in a piano has a length of L = 0.9m and a mass of m = 5.4 g. To what tension T must this wire be stretched so that its fundamental а. vibration possess a frequency f= 261.6 Hz? b. The equation of a plane sound wave is, y(x, t) = 6.0 × 10-6 sin(5.7x – 1500t). Find the frequency, the wavelength and the velocity of the wave. Compare the wavelength with the amplitude of the oscillations and the wave velocity with the amplitude of the velocity of the oscillations. What is the phase shift between the oscillations of two points 30.0 cm apart in the direction of the sound wave?
AM radio signals are broadcast at frequencies between 550 kHz (kilohertz) and 1600 kHz and travel at 3 x 10^8 m/s. a) What is the range of wavelengths for those signals? b) FM frequencies range between 88 MHz (megahertz) and 108 MHz and travel at the the same speed. What is the range of the FM frequencies.
Question 4 (a) Write your understanding about coherent waves. (b) A loudspeaker hanging on a long rod radiates sound waves uniformly in all directions. At a distance of 15.0 m from the speaker, the sound intensity is 0.25 W/m². At what distance is the intensity 0.1 W/m²? Question 5 (a) A 1.4-kg 15-cm-diameter solid sphere is rotating about its diameter at 70 rev/min. What is its kinetic energy? (b) Explain why you expect an object made of a stiff material to vibrate at a higher frequency than a similar object made of a more flexible material.
An audio system is emitting a sound at a frequency of 676 Hz through two speakers separated by a distance d = 0.620 m. What's the shortest distance for a person to hear maximum intensity if he was facing the speaker on the right (see picture).
Imagine you are in an open field where two loudspeakers are set up and connected to the same amplifier so that they emit sound waves in phase at 688 HzHz. Take the speed of sound in air to be 344 m/sm/s. What is the shortest distance d you need to walk forward to be at a point where you cannot hear the speakers? The forward direction is defined as being perpendicular to a line joining the two speakers and you start walking from the line that joins the two speakers.
The shortest distance between a sound source (S,) and a reflecting wall is 25 m. The sound is reflected at an angle of a, = 45° to a listener (L,). (a) What is the shortest distance between the sound source and the listener, (x1)? (b) The sound is also reflected to another listener (L2) at an angle of a2= 80°. What is the length of the reflector between the two reflection points, (x2)? X2 = ? Reflector a2 a1 L2 L1 S1 X1 = ?
Jo and Em are both standing different distances from a speaker that is outputting 4. sound uniformly in all directions. Jo is hearing a sound intensity level of 35.0dB. Em is hearing a sound intensity level of 62.0dB. a. What are the intensities heard by Jo and Em? [Recall that there is a difference in meaning between "sound intensity level" and "intensity".] b. If Jo is 150m from the speaker, how far is Em from the speaker? c. If Em's eardrum is 1.20x10 m? , how much sound energy hits Em's eardrum in 20.0s ?
A mono digital sound sample has a bit depth of 8 bits and a sampling rate of 9000 Hz. How much memory in bytes would it take to store 45 minutes of sound at this quality? Calculate your answer in bytes.