A closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has
A
three nodes and three antinodes
B
three nodes and four antinodes
C
four nodes and three antinodes
D
four nodes and four antinodes
AIPMT 1991, Medium
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D
four nodes and four antinodes
d Third overtone has a frequency $7 n$, which means $L=\frac{7 \lambda}{4}=$ three full loops $+$ one half loop, which would make four nodes and four antinodes.
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