The period T of the fundamental mode of the air in a pipe open at one end and closed at the other is equal to what multiple or fraction of the time ?t required for a sound wave to travel from one end of the tube to the other?
A. T = ?t/4
B. T = ?t/2
C. T = ?t
D. T = 2?t
E. T = 4?t
E. T = 4?t
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