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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] :-
(1) 361 Hz (2) 411 Hz (3) 448 Hz (4) 350 Hz

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(3) As we known from Doppler's Effect\

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