Choose the one alternative that best completes the statement or answers the question. -What is the frequency does a stationary observer hear when a train approaches her with a speed of

Choose the one alternative that best completes the statement or answers the question.
-What is the frequency does a stationary observer hear when a train approaches her with a speed of 30 m/s. The frequency of the train horn is 0.600 kHz and the speed of sound is 340 m/s.
A) 551 Hz
B) 653 Hz
C) 600 Hz
D) 658 Hz

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