Two Loudspeakers Are Located 3

question 18

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.
-At what frequency or frequencies will the listener at P hear a maximum intensity?

• A)170 Hz only
• B)113 Hz and 226 Hz
• C)86 Hz,170 Hz,257,and 343 Hz
• D)57 Hz,114 Hz,171 Hz,228 Hz,285,342,and 399 Hz
• E)43 Hz,85 Hz,128 Hz,170 Hz,213 Hz,257 Hz,298,344,and 387 Hz

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