2) Ten cars in a circle at a boom box competition produce a 120-dB sound intensity level at the center of the circle. What is the average sound intensity level produced there by each stereo, assuming interference effects can be neglected?
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- At an outdoor music event, a dB meter records 130 dB when placed 2.25 m in front of aloudspeaker near the stage. A) What was the power output of the speaker, assuminguniform spherical spreading of the sound and neglecting any absorption, reflection andinterference of the sound that may occur? B) How far away would you need to be forthe sound level to be 80 dB?Ten cars in a circle at a boom box competition produce a 120-dB sound intensity level at the center of the circle. What is the average sound intensity level produced there by each stereo, assuming interference effects can be neglected?A 30 Hz sound is annoying or dissonant to the ear. If one clarinet plays a sound at a frequency of 360 Hz, at what frequencies (more than one) might another clarinet simultaneously play so the dissonant 30 Hz beats are created? Explain.
- 4. A two-point source interference pattern is generated in a ripple tank by identical sources vibrating in phase and located 12.0 cm apart. There are 7 nodal lines observed on each side of the right bisector. If the wavelength of the source is doubled and they remain in phase: The number of nodal lines observed doubles the frequency doubles the speed of the waves doubles the number of nodal lines decreases to half the average distance between nodal lines decreasesItem 12 IP Two violinists, one directly behind the other, play for a listener directly in front of them. Both violinists sound concert A (440 Hz). Part A What is the smallest separation between the violinists that will produce destructive interference for the listener? d = Submit Part B —| ΑΣΦ Request Answer increases Submit Does this smallest separation increase or decrease if the violinists produce a note with a higher frequency? decreases ? Request Answer mExample M 500 High Rings for some time before dying out. A tuning fork with Q = 1000 is struck, producing a sound at 1 m of 60 dB with a frequency of 440 Hz. How loud is the sound after 10 seconds...? Q=1/4 A(t) = Age-t 入
- TI The sound intensity level 5.0 m from a large power saw is 100 dB. At what distance will the sound be a more tolerable 80 dB? Express your answer with the appropriate units. R₂ = Submit ΠΑ Templates Value Provide Feedback Request Answer Units ?4. Two side-by-side (virtually no separation) speakers are wired such that they emit a single-frequency sound out of phase with each other by radians, and radially-outward. The tone heard from the two speakers combined has a decibel level of 36 dB. a. If one of the speakers is suddenly disconnected, what is the decibel level heard? b. If both speakers are connected and the listener moves to a distance from the speakers that is 5 times greater than where the 36dB sound was heard, what is the new decibel level heard? Assume that the waves travel radially from the speakers.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).
- 2. While Dr. Benton was waiting at a stop light the other day, a car pulled up next to him emitting low frequency periodic thumping sounds out from the subwoofers of its stereo system at an intensity that he estimated to be 100 dB. If the car was 5 m away, how intense was the music for the people in the car sitting 1 m away from the speakers?2A 1,720-Hz tone is played on a stereo in an open field. A person stands at a point that is 4 m from one of the speakers and 4.4 m from the other. What must the minimum wavelength be for the person to hear the tone? (Hint: because of interference, two waves add constructively or destructively. If the sound is heard the interference must be constructive. For interference to be constructive, the difference in distance must be a multiple of the wavelength. That is, the difference in distances from the speakers must be 1 wavelength, two wavelengths, three wavelengths, etc.)