A car $P$ travelling at $20\,ms ^{-1}$ sounds its horn at a frequency of $400\,Hz$. Another car $Q$ is travelling behind the first car in the same direction with a velocity $40\,ms ^{-1}$. The frequency heard by the passenger of the car $Q$ is approximately $.......\,Hz$ [Take, velocity of sound $=360\,ms ^{-1}$ ]
JEE MAIN 2023, Medium
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$f=f_0\left(\frac{c+v_0}{c+v_s}\right)$
$f=400\left(\frac{360+40}{360+20}\right)$
$f=421\,Hz$
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