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A fire truck emits its siren at 800 Hz. As the truck approaches a stationary observer on the
sidewalk, he perceives the pitch to be 920HZ. Approximately what pitch does he hear after the
truck passes and is moving away? Assume the truck's velocity remains constant, and that the
velocity of sound in air is 340m/s.
780 Hz
695 Hz
O 708 Hz
O 757 Hz

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