Iowa State University
What does it mean if two sources are in phase? Out of phase?When does constructive interferenceTwo speakers separated by a distance of 4.3m emit sound of frequency 221Hz. The speakers are in phase with one another. A person listens from a location 2.8m directly in front of one of the speakers. Does the person hear constructive or destructive interference?What is the first harmonic wavelength of a string length L that is tied down at both ends?What is the nth harmonic wavelength of a string length L that is tied down at both ends?Sketch the 1st, 2nd, and 3rd harmonic of a string tied down at both ends.What is the first harmonic wavelength of a pipe length L open at one end?What is the nth harmonic wavelength of a pipe length L open at one end?Draw the 1st, 3rd and 5th harmonic standing waves in a pipe open at one end.An organ pipe that is open at both ends is 3.5m long. What is its fundamental frequency?A guitar string 66cm long vibrates with a standing wave that has three antinodes. A)Which harmonic is this? B) What is the wavelength of this wave?Two loudspeakers are placed at either end of a gymnasium, both pointing toward the center of the gym and equidistant from it. The speakers emit 266Hz sound that is in phase. An observer at the center of the gym experiences constructive interference. How far toward either speaker must the observer walk to first experience destructive interference? ................
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