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The submarine captain spots another merchant ship several kilometers away, but the ship's motion relative to the stationary submarine is unknown-it could only either be moving toward the submarine or

away from it. The submariners aim the sonar wave,which has a frequency of 256 Hz, at the ship. What kind of reflected sonar wave would the submariners expect to hear if the merchant ship were moving TOWARD them? A. The sonar's pitch would decrease. B. The sonar's pitch would increase. C. The sonar's pitch would not change. D. The submariners would hear no sound whatsoever.

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