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A source of sound is traveling at \( \frac{100}{3} \mathrm{~ms}^{-1} \) along a road,
P towards a point \( A \). When the source is \( 3 \mathrm{~m} \) away from \( A \), a
\( \mathrm{VV} \) person standing at a point \( O \) on a road perpendicular to the track hears a sound of frequency ' \( v \) '. The distance of \( O \) from \( A \) at that time is \( 4 \mathrm{~m} \). If the original frequency is \( 640 \mathrm{~Hz} \), then the value of \( v \) is (given velocity of sound \( =340 \mathrm{~m} / \mathrm{s} \) )
a. \( 620 \mathrm{~Hz} \)
b. \( 680 \mathrm{~Hz} \)
c. \( 720 \mathrm{~Hz} \)
d. \( 840 \mathrm{~Hz} \)
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