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Two small identical speakers are connected in phase to the same source. The speakers are \( 3 \mathrm{~m} \) apart and at ear level. An observer stands at \( P, 4 \mathrm{~m} \) in from of one speaker as shown. The sound she hears is least intense when the wavelength is \( \lambda_{1} \) and most intense when the wavelength is \( \lambda_{2} \)
Then possible values of \( \lambda_{1} \) and \( \lambda_{2} \) are
[KVPY 2009]
(a) \( \lambda_{1}=1 m \) and \( \lambda_{2}=2 m \)
(b) \( \lambda_{1}=4 m \) and \( \lambda_{2}=3 m \)
(c) \( \lambda_{1}=2 m \) and \( \lambda_{2}=1 m \)
(d) \( \lambda_{1}=0.5 \mathrm{~m} \) and \( \lambda_{2}=0.25 \mathrm{~m} \)
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