Two Loudspeakers Are Located 3

Multiple Choice

Two loudspeakers are located 3.0 m apart on the stage of an auditorium. A listener at point P is seated 19.0 m from one speaker and 15.0 m from the other. A signal generator drives the speakers in phase with the same amplitude and frequency. The wave amplitude at P due to each speaker alone is A. The frequency is then varied between 30 Hz and 400 Hz. The speed of sound is 343 m/s.
-Determine the value of the maximum amplitude in terms of A.

A) 2.0A
B) 2.5A
C) 3.0A
D) 4.0A
E) 5.0A