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23 Nov 2019

Two identical audio speakers connected to the sameamplifierproduce in-phase sound waves with a single frequency thatcan bevaried between 335 and 570 Hz The speed of sound is340 m/s.You find that where you are standing, you hearminimum-intensitysound.
Explain why you hear minimum-intensity sound?
If one of the speakers is moved 38.8 cm toward you, thesoundyou hear has maximum intensity. What is the frequency ofthesound?
How much closer to you from the position in part B mustthespeaker be moved to the next position where you hearmaximumintensity?

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Two speakers emit sound waves with frequency 3.33 kHz. They aredriven by
the same oscillator so that they are in phase with each other. Iplace the speakers
side-by-side, and I stand across the room from them. If someonemoves one of the
speakers toward me, I hear the total intensity drop and then riseagain. How far (cm) did he move the speaker to the point where Iheard a minimum intensity due to destructive interference of thesound waves from the two speakers? The speed of sound is 343 m/s.

Two loudspeakers 6.0 m apart are playing the same frequency. If youstand 12.0 m in front of the plane of the speakers, centeredbetween them, you hear a sound of maximum intensity. As you walkparallel to the plane of the speakers, staying 12.0 m in front ofthem, you first hear a minimum of sound intensity when you aredirectly in front of one of the speakers.

Part A)
What is the frequency of the sound? Assume a sound speed of 340m/s.
I got 120.02 Hz. This is right, I checked.

Part B)
If you stay 12.0 m directly in front of one of the speakers, forwhat other frequencies between 100 Hz and 700 Hz is there a minimumsound intensity at this point?

Express your answer numerically. If there is more than one answer,enter your answers in ascending order separated by commas.

Sorry, I can't figure out this part B! Thanks so much.

Two 350.0-W speakers, A and B, are separated by a distance D = 3.41m. The speakers emit in-phase sound waves at a frequency f =11800.0 Hz. Point P1 is located at x1= 4.51 m and y1 = 0 m; pointP2 is located at x2 = 4.51 m and y2 = –?y.
a) Neglecting speaker B, what is the intensity, IA1 (in W/m2), ofthe sound at point P1 due to speaker A? Assume that the sound fromthe speaker is emitted uniformly in all directions.
b) What is this intensity in terms of decibels (sound level,ßA1)?
c) When both speakers are turned on, there is a maximum in theircombined intensities at P1. As one moves toward P2, this intensityreaches a single minimum and then becomes maximized again at P2.How far is P2 from P1, that is, what is ?y? You may assume that L>> y and that D >> y, which will allow you to simplifythe algebra by using (a±b)1/2 ˜ a1/2 ± 0.5b/a1/2 when a >> b.

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