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Physics

A sound of constant frequency is produced by the si-ren on top of a firehouse. Compared to the frequen-cy produced by the siren, what is the frequency heard by a firefighter approaching the firehouse? What if the firefighter is driving away?

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  1. Driving toward, the frequency increases.
    Driving away, the frequency decreases

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    2. 👎
    3. ℹ️
    4. 🚩

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