In the 5th overtone of an open organ pipe, these are $(N-$ stands for nodes and $A-$ for antinodes)
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(c) In open organ pipe $5$th overtone corresponds to $4$th harmonic mode.
Also in open pipe, Number of nodes = Order of mode of vibration and number of antinodes = (Number of nodes $+ 1$). Here number of nodes $= 4$, Number of antinodes $= 4 + 1 =5$.
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