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(a) What frequency (in Hz) is received by a person watching an oncoming ambulance moving at 114 km/h and emitting a steady 550 Hz sound

(a) What frequency (in Hz) is received by a person watching an oncoming ambulance moving at 114 km/h and emitting a steady 550 Hz sound from its siren? The speed of sound on this day is 345 m/s. Hz (b) What frequency (in Hz) does she receive after the ambulance has passed? Hz

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