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A person sitting in a parked car hears an approaching ambulance siren at a frequency f1 and as it passes him and moves away he hears a frequency f2. The actual frequency f of the source is Group of answer choices

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Answer: this is actually known as Doppler effect because the source of the sound (ambulance) is heard with respect to the observer (car owner)

Explanation: long wave length with give low frequency while short wave length will give high frequency

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