\( \mathrm{S}_{1} \& \mathrm{~S}_{2} \) are two coherent sources of...

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\( \mathrm{S}_{1} \& \mathrm{~S}_{2} \) are two coherent sources of sound having
P no initial phase difference. The velocity of sound is

W \( 330 \mathrm{~m} / \mathrm{s} \). No minima will be formed on the line passing through \( \mathrm{S}_{2} \) and perpendicular to the line joining \( S_{1} \) and \( S_{2} \), if the frequency of both the source is:
(1) \( 50 \mathrm{~Hz} \)
(2) \( 60 \mathrm{~Hz} \)
(3) \( 70 \mathrm{~Hz} \)
(4) \( 80 \mathrm{~Hz} \)
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