Two loudspeakers \( L_{1} \) and \( \tilde{L}_{2} \) driven by a common oscillator and amplifier...

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Two loudspeakers \( L_{1} \) and \( \tilde{L}_{2} \) 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 \( 330 \mathrm{~ms}^{-1} \), then the frequency at which the first maximum is observed is
(a) \( 165 \mathrm{~Hz} \)
(b) \( 330 \mathrm{~Hz} \)
(c) \( 496 \mathrm{~Hz} \)
(d) \( 660 \mathrm{~Hz} \)
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