You are standing between two stereo speakers that are emitting sound of wavelength 9.00cm in step with each other. They are very far apart compared with that wavelength.
Part A
If you start in the middle and walk a distance x directly toward one speaker, you observe that the sound from these speakers first cancels when x is equal to
a. 18.0cm
b. 9.00cm
c. 4.50cm
d. 2.25cm
