Two identical loudspeakers separated by distance demit 170 Hz sound waves along the x-axis. As you walk...
Two identical loudspeakers separated by distance demit 170 Hz sound waves along the x-axis. As you walk along the axis, away from the speakers, you don't hear anything even though both speakers are on.
What are the three lowest possible values for d? Assume a sound speed of 340 m/s .
Homework Answers
Solution,
Wavelength, lambda = 340/170 = 2m
Condition for destructive interference,
d = (m + 0.5) lambda
for the first minima m =0, ±1,± 2 ...
m = 0,
d = lambda /2 = 2/ 2 = 1 m (Ans)
m = 1,
d = 3 lambda /2 = 3 m (Ans)
m = 2,
d = 5 lambda /2 = 5 m (Ans)
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