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Q.

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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a

421.6 Hz

b

500 Hz

c

458.33 Hz

d

550 Hz

answer is C.

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Detailed Solution

n11=V−VsV+Vs×n1

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