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An ambulance moving at 43 m/s sounds its siren whose frequency is 400 Hz. A car is moving in the same direction as the ambulance at 19 m/s. (a) What frequency does a person in the car hear as the ambulance approaches the car? Hz (b) What frequency does a person in the car hear after the ambulance passes the car? Hz

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Au 13 m 干vs elocty ot ssund 341 mls s peed Fl= ( 343+19 | x 400 243 43 43 m)s X 460 343-43

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