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Question

# 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 (Take velocity of sound 340 m/s)

A
448Hz
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B
350Hz
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C
361Hz
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D
411Hz
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Solution

## The correct option is A 448HzGiven: f1=400Hz Vs=340m/s when both source and observer are moving towards each other Let V1 be the velocity of 1st driver and V2 be the velocity of 2nd Frequency heard by driver of second car, f2=(Vs+V2Vs−V1)f1 =340+16.5340−22×400=356.5318×400 ≅448Hz

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