Compute the each part of given problemproblem an ambulance, Ask an Expert

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Compute the each part of given problem:

Problem: An ambulance moving at 40 m/s sounds its siren whose frequency is 440 Hz. A car is moving in the same direction as the ambulance at 20 m/s.

Part I: What frequency does a person in the car hear as the ambulance approaches the car?

Part II: What frequency does a person in the car hear after the ambulance passes the car?

I need proficient help in the above problem.

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