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July 2021 1 24 Report
A police car travelling at 30.0 m/s sounds its 525 Hz siren as it approaches a person standing on the side of the road . If the speed of sound is 344 m/s, what frequency is heard by the person?

(A) 483 Hz
(B) 525 Hz
(C) 555 Hz
(D) 575 Hz

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