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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 approximately will he hear after the car has passed?

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421.6 Hz

500 Hz

458.33 Hz

550 Hz

answer is C.

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Detailed Solution

$n^{11} = \frac{V - V_{s}}{V + V_{s}} \times n^{1}$

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