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# Interference of 2 Waves.

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Two loudspeakers are placed side by side a distance d=4.00m apart. A listener observes maximum constructive interference while standing in front of the loudspeakers, equidistant from both of them. The distance from the listener to the point halfway between the speakers is l=5.00m.

One of the loudspeakers is then moved directly away from the other. Once the speaker is moved a distance r=60cm from its original position, the listener, who is not moving, observes destructive interference for the first time.
(SEE ATTACHED DIAGRAM)

The attached picture shows the situation described. The upper speaker is initially at the same distance from the listener as the other speaker. Then it is moved a distance r=60cm. The dashed outline represents its new position. (Note that the distance, r1, between the listener and the speaker has not moved, whereas, r2, the distance between the listener and the speaker has moved.)

Calculate r1 and r2 (to 4 significant figures)

r1 = _________________m
r2 = _________________ m