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Two small stereo speakers A and B that are 1.40m apart are sending out sound of wavelength 33.5cm in all directions and all in phase. A person at point P starts out equidistant from both speakers and walks (see the figure (Figure 1) ) so that he is always 1.50m from speaker B. Limit your solutions to the cases where x≤1.50m.

1. Give the five positive values of x for which the sound will be maximally reinforced. Begin at the central maximum (m = 0.)

Enter your answers in decreasing order separating them with commas.

2. Give four positive values of x for which the sound will be cancelled?

Begin with the first minimum that follows the central maximum. Enter your answers in decreasing order separating them with commas.

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