Waves - Result Question 68

70. Two cars moving in opposite directions approach each other with speed of 22m/s and 16.5m/s respectively. The driver of the first car blows a horn having a frequency 400Hz. The frequency heard by the driver of the second car is [velocity of sound 340m/s ] : [2017]

(a) 361Hz

(b) 411Hz

(c) 448Hz

(d) 350Hz

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Answer:

Correct Answer: 70. (c)

Solution:

  1. (c) As we known from Doppler’s Effect

fapprent =f0[v+v0vvs]=400[340+16.534022]

fapprent =448Hz

Af0=400HzVs=22m/sV0=16.5m/sB



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