Two source of sound \( s_{1} \) and \( s_{2} \) emitting sound of (IV) frequency \( 324 \mathrm{...

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Two source of sound \( s_{1} \) and \( s_{2} \) emitting sound of
(IV) frequency \( 324 \mathrm{~Hz} \) and \( 320 \mathrm{~Hz} \) are situated at certain distance apart. An observer moves along the line joining the two sources. What should be the velocity of the observer if no beats are heard: (Velocity of sound is \( 344 \mathrm{~m} / \mathrm{s} \) )
(1) \( 20 \mathrm{~m} / \mathrm{s} \)
(2) \( 10 \mathrm{~m} / \mathrm{s} \)
(3) \( 5 \mathrm{~m} / \mathrm{s} \)
(4) \( 2.1 \mathrm{~m} / \mathrm{s} \)
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