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Tutorial Sound Waves . A sound source which produces sound of frequency 300 Hz moves along a straight line and passes by a stationary observer. The observer notices that the frequency of sound heard change Speed of sound in air 330 m s-1] 0when the sound is moving away from him. Determine the speed of the sound source. its siren emitting a sound of frequency 600.0 Hz moves with a speed of me that the speed of sound is 345 ms-11 30.0 ms1. [Assu Calculate the frequency of the siren heard by a stationary pedestrian who is behind the Calculate the frequency of the siren heard by a driver of a car moving with a speed of 20.0 m s-1 away from the ambulance in the opposite direction. ambulance. (b)

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