Q6 of 118 Page 351

Draw a diagram to show the standing pressure wave and standing displacement wave for the 3rd overtone mode of vibration of an open organ pipe.

Frequencies for a standing wave in an open organ pipe is given by, , where n = 1, 2,

n = 1 is for the fundamental mode of vibration. For the 3rd overtone mode of vibration n = 4, and the corresponding . It will have four pressure antinodes. Corresponding to these antinodes there will be four displacement nodes. The diagram is the following: -




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