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An ambulance siren that is at rest emits a sound wave of a wavelength of 1m. What is the wavelength that an observer at rest,

An ambulance siren that is at rest emits a sound wave of a wavelength of 1m. What is the wavelength that an observer at rest, with respect to the street, measures when the ambulance siren is moving towards him at a speed of 11 m/s?

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