Two stereo speakers mounted 4.52 m apart on a wall emit identical sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers. You walk 2.11 m
Parallel to the wall, to a location where you first notice that the sound intensity is essentially zero.
If the wall along which you are walking is 10.7 m from the wall with the speakers, what is the
Wavelength of the sound waves? The walls are cushioned to absorb sound reflections.
A) 2.05 m
B) 2.57 m
C) 1.71 m
D) 2.91 m

Question

Quizplus · Accepted Answer

The path difference between the sound waves from the two speakers at the point of destructive interference is half a wavelength. Using the geometry of the situation and the Pythagorean theorem, the path difference can be calculated, leading to the wavelength of 1.71 m.

Two Stereo Speakers Mounted 4