Two loudspeakers, A and B, radiate sound uniformly in all directions in air (see Figure). The speed of sound in air is 344 m/s. The acoustic power output from A is 8.00 × 10¬4 w and the power output from B is 6.00 × 10–4 w. Both loudspeakers are vibrating in phase at a frequency of 172 Hz. Determine the sound intensity level (in dB) at a point C along the line joining A and B, 3.00 m from B and 4.00 m from A. Hint: The intensity is proportional to the wave amplitude A. We can write the intensity as I = KA² where K is a constant. If two different wave amplitudes A1 and A, are at the same point in space they add by superposition: Atot = A1 + A2

Two loudspeakers, A and B, radiate sound uniformly in all directions in air (see Figure). The speed of sound in air is 344 m/s. The acoustic power output from A is 8.00 × 10¬4 w and the power output from B is 6.00 × 10–4 w. Both loudspeakers are vibrating in phase at a frequency of 172 Hz. Determine the sound intensity level (in dB) at a point C along the line joining A and B, 3.00 m from B and 4.00 m from A. Hint: The intensity is proportional to the wave amplitude A. We can write the intensity as I = KA² where K is a constant. If two different wave amplitudes A1 and A, are at the same point in space they add by superposition: Atot = A1 + A2

University Physics Volume 1

18th Edition

ISBN:9781938168277

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

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

Chapter16: Waves

Section: Chapter Questions

Problem 111P: Two sinusoidal waves with identical wavelengths and amplitudes travel in opposite directions along a...

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