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An object, shown as the dark circle below, is moving along and emitting sound waves. The sound waves that were emitted by the object at times 1 second (one second ago), 2 seconds, and 3 seconds are shown below.

If the Mach number of the object is equal to unity, which is the correct picture for the sound waves?

519_d70850ba-5cfe-4efd-a4f8-1ccc3019b64f.png

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