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A car is moving towards a stationary observer at a speed of 108 km/hr. The speed of sound is 330 m/s. If the observer hears the frequency of horn as 550 Hz, what frequency will he hear after the car has passed?

Option 1 -

550 Hz

Option 2 -

500 Hz

Option 3 -

458.33 Hz

Option 4 -

421.6Hz

0 3 Views | Posted 2 months ago
Asked by Shiksha User

  • 1 Answer

  • V

    Answered by

    Vishal Baghel | Contributor-Level 10

    2 months ago
    Correct Option - 3


    Detailed Solution:

    v = 1 0 8 × 5 1 8 = 3 0 m / s

    f 1 = C C − v f 0

    f = 3 3 0 3 3 0 + 3 0 × 5 0 0 = 3 3 3 6 × 5 0 0 = 5 5 0 0 1 2

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