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B8

During a hurricane, a 1,200 Hz warning siren on the town hall
sounds. The wind is blowing at 55 m/s in a direction from the siren
toward a person 1 km away. With what frequency does the sound
wave reach the person? (The speed of sound in air is 330 m/s.)
1,030 Hz.
O 1,400 Hz.
O 1,200 Hz.
1,000 Hz.
1,440 Hz.

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