Two loudspeakers L 1 and L 2 , driven by a common oscillator and amplifier, are arranged as shown. The frequency of the oscillator is gradually increased from zero and the detector at D records a series of maxima and minima. If the speed of sound is 330 ms -1 , then at what frequency (in Hz) does the first maximum is observed?
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(330)
Let 
path difference
For first maximum, 
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