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  4. Two persons A and B , in two cars, are moving in opposite direction away from each other with same speed 20ms- 1 . If frequency heard by A is 2000Hz , then original frequency of B is (velocity of sound is 340ms- 1 )

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Q. Two persons $A$ and $B$ , in two cars, are moving in opposite direction away from each other with same speed $20ms^{- 1}$ . If frequency heard by $A$ is $2000Hz$ , then original frequency of $B$ is (velocity of sound is $340ms^{- 1}$ )

NTA AbhyasNTA Abhyas 2020

Solution:

$n^{1}=\left(\frac{v + v_{o}}{v - v_{s}}\right)n$ OR $n^{1}=\left(\frac{v - v_{o}}{v + v_{s}}\right)n$