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Two small loudspeakers A , B ( 1m apart)...

Two small loudspeakers `A , B` ( `1m` apart) are connected to the same oscillator so that both emit sound waves of frequency `1700 Hz` in phase . `A` sensitive detector , detects a maximum wave at `P` on the perpendicular bisector `MP of AB` and another maximum wave when it first reaches a point `Q` directly opposite to `B`. Calculate the speed `c` of the sound waves in air .

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