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Two sources of sound are moving in opposite directions with velocities \( v_{1} \) and \( v_{2}\left(v_{1}v_{2}\right) \). Both are moving away from a stationary observer. The frequency of both the sources is \( 1700 \mathrm{~Hz} \). What is the value of \( \left(v_{1}-v_{2}\right) \) so that the beat frequency observed by the observer is \( 10 \mathrm{~Hz} \) ? \( v_{\text {sound }}=340 \mathrm{~m} / \mathrm{s} \) and assume that \( v_{1} \) and \( v_{2} \) both are very much less than \( v_{\text {sound }} \).
(a) \( 1 \mathrm{~m} / \mathrm{s} \)
(b) \( 2 \mathrm{~m} / \mathrm{s} \)
(c) \( 3 \mathrm{~m} / \mathrm{s} \)
(d) \( 4 \mathrm{~m} / \mathrm{s} \)
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