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I'm sitting on my front porch. Suddenly a fire truck comes down the street, racing toward me at 35 m/s. The truck's siren seems to

I'm sitting on my front porch. Suddenly a fire truck comes down the street, racing toward me at 35 m/s. The truck's siren seems to me to have a frequency of 234 hertz. What is the normal frequency of this siren?

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