In the figure, two speakers separated by distance d = 2.00 m are in phase. You are standing 4.00 m directly in front of one speaker. Each speaker has an output power of 1.30 W. Because the speakers are at different distances, there will be frequencies at which the sound from the speakers interferes destructively. But because the speakers are at different distances, the sound intensities will not be the same, so the destructive interference will not be complete. We want to find the sound level when there is destructive interference Use 343 m/s for the speed sound in air. Speakers Listener (a) What is the lowest frequency that gives minimum signal (destructive interference) at your ear? 365 v HZ (b) What is the second lowest frequency that gives minimum signal? 1106.45 v Hz (c) What is the intensity from the near speaker? (note: keep 6 significant figures or rounding may screw up your answer to part f) 0.0064 v w/m2 (d) This part intentionally left blank (e) What is the intensity from the far speaker? (note: keep 6 sigfigs) w/m2 (f) What is the combined intensity during destructive interference? Because the sources are coherent, amplitudes add (or subtract) but intensities do not. W/m2
In the figure, two speakers separated by distance d = 2.00 m are in phase. You are standing 4.00 m directly in front of one speaker. Each speaker has an output power of 1.30 W. Because the speakers are at different distances, there will be frequencies at which the sound from the speakers interferes destructively. But because the speakers are at different distances, the sound intensities will not be the same, so the destructive interference will not be complete. We want to find the sound level when there is destructive interference Use 343 m/s for the speed sound in air. Speakers Listener (a) What is the lowest frequency that gives minimum signal (destructive interference) at your ear? 365 v HZ (b) What is the second lowest frequency that gives minimum signal? 1106.45 v Hz (c) What is the intensity from the near speaker? (note: keep 6 significant figures or rounding may screw up your answer to part f) 0.0064 v w/m2 (d) This part intentionally left blank (e) What is the intensity from the far speaker? (note: keep 6 sigfigs) w/m2 (f) What is the combined intensity during destructive interference? Because the sources are coherent, amplitudes add (or subtract) but intensities do not. W/m2
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e and f
Transcribed Image Text:In the figure, two speakers separated by distance d, = 2.00 m are in phase. You are standing 4.00 m directly in front of one speaker. Each speaker has an output power of 1.30 W. Because the speakers are at different distances, there will be frequencies at which the
sound from the speakers interferes destructively. But because the speakers are at different distances, the sound intensities will not be the same, so the destructive interference will not be complete. We want to find the sound level when there is destructive interference.
Use 343 m/s for the speed of sound in air.
Speakers
Listener
dg
(a) What is the lowest frequency that gives minimum signal (destructive interference) at your ear?
365
Hz
(b) What is the second lowest frequency that gives minimum signal?
1106.45
V Hz
(c) What is the intensity from the near speaker? (note: keep 6 significant figures or rounding may screw up your answer to part f)
0.0064
W/m2
(d) This part intentionally left blank
(e) What is the intensity from the far speaker? (note: keep 6 sigfigs)
W/m2
(f) What is the combined intensity during destructive interference? Because the sources are coherent, amplitudes add (or subtract) but intensities do not.
W/m2
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