Two speakers A and B, placed 1m apart, e...

Two speakers `A` and `B`, placed `1m` apart, each produce sound waves of frequency `1800 Hz` in phase. A detector moving parallel to line of speakers distant `2.4 m` away detects a maximum intensity at `ɵ` and then at `P`. Speed of sound wave is

`330 ms^(-1)`

`360 ms^(-1)`

`350 ms^(-1)`

`340 ms^(-1)`

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