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sound waves produced in one end of a cardboard tube (point A) move to the ear of a listener at the other end of the tube (point B). As the waves move from A to B inside the tube, which of the following are true?
A. information (energy) is transferred from A to B
B. air molecules are transferred from A to B
C. oscillations of molecules occur perpendicular to a line from A to B
D. the frequency of oscillations decreases as the waves move farther in the tube from A to B

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