Two loudspeakers, one of them generates sound 400W power the other with 100W. Th

Question

Two loudspeakers, one of them generates sound 400W power the other with 100W. The sound is generated isotropically from each loudspeaker. A listener is seated 20 m from the 100 W loudspeaker and 40 m from the other loudspeaker. A signal generator drives the two loudspeakers in phase with the same frequency. The frequency is swept through the audible range from 20-20000 Hz.

A). What is the ratio of the intensities of the two sounds (I(for 400 W)/I(for 100 W) at the listener position?

B). What are the two highest frequencies at which the listener will hear a maximum signal because of constructive interference?

C). What are the two highest frequencies at which the listener will hear a minimum signal because of destructive interference?

D). Assuming a single frequency of sound (f=5000 Hz) from the 400 W loudspeaker. What is the displacement amplitude of the sound waves that arrives at the listener's position from the 400 W loudspeaker only?

Explanation / Answer

http://www.physicsforums.com/showthread.php?p=3498894 This should help!

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