Two out of phase loudspeakers are some distance apart. A person stands 5.40 m from one speaker and 3.20 m from the other. What is the second lowest frequency at which constructive interference will occur? The speed of sound in air is 346 m/s.

If a large housefly 3.0 m away from you makes a noise of40.0 dB, what is the noise level of 1000 flies at that distance,assuming interference has a negligible effect?

Two speakers connected to the same frequency generator emit a sound with afrequency of 500 Hz. As a person walks around in the room, he finds areas wherethe sound becomes loud and clear and areas where it is more muffled. At one spotwhere the sound is a maximum, the student is 3.2 m from one speaker. What isthe closest possible distance he could be to the other speaker?

Solve Apo = 0 Submit ✓ Correct Because constructive interference is observed when Ar = 0, that is, when the listener is equidistant from the sources, the speakers must be sources of in-phase waves. Part C Find v, the speed of the sound waves in air. Express your answer in meters per second to three significant figures. ► View Available Hint(s) v = 351 m/s Submit Previous Answers Review Part D T₂ = Previous Answers Correct How far (r.) from its original location should the speaker be moved for the listener to experience constructive interference for the second time? Express your answer in meters to three significant figures. ► View Available Hint(s) OF IVE ΑΣΦ ? m