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A fire engine is traveling at 40 m/s East with its siren blaring a tone at a frequency of 440 Hz.You happen to also be

A fire engine is traveling at 40 m/s East with its siren blaring a tone at a frequency of 440 Hz.You happen to also be driving East at 10 m/s when you look in the rear view mirror and see the approaching fire engine. What frequency do you hear as the fire engine is right behind you?

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