1.

Two loudspeakers are located 3 m apart on the stage of an auditorium. A listener at point P is seated 29.0 m from one speaker and 25.0 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 20 Hz and 300 Hz. The speed of sound is 343 m/s.At what frequency or frequencies will the listener at P hear a maximum intensity?

Answer»

170 HZ only
57 Hz, 113 Hz, 170 Hz, 227 Hz, and 284 Hz
113 Hz and 226 Hz
86 Hz, 170 Hz, 257 Hz

Answer :D


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