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  4. Two cars moving in opposite directions approach each other with speed of 22 m/s and 16.5 m/s respectively. The driver of the first car blows a horn having a frequency 400 Hz. The frequency heard by the driver of the second car is [velocity of sound 340 m/s] :

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Q. Two cars moving in opposite directions approach each other with speed of $22\, m/s$ and $16.5\, m/s$ respectively. The driver of the first car blows a horn having a frequency $400\, Hz$. The frequency heard by the driver of the second car is [velocity of sound $340\, m/s$] :

NEETNEET 2017Waves

Solution:

$f_{A} =f\left[\frac{v + v_{0}}{v-v_{s}}\right]$
$= 400\left[\frac{340+16.5}{340-22}\right]$
$f_{A} =448\, Hz$