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(D) For a closed organ pipe,the frequencies of the harmonics are given by $f_n = (2n - 1)f_1$,where $n = 1, 2, 3, ...$ is the harmonic number.The fund

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four nodes and four antinodes

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(D) For a closed organ pipe,the frequencies of the harmonics are given by $f_n = (2n - 1)f_1$,where $n = 1, 2, 3, ...$ is the harmonic number.The fundamental frequency $(n=1)$ is the first harmonic.The first overtone is the third harmonic $(n=2)$.The second overtone is the fifth harmonic $(n=3)$.The third overtone is the seventh harmonic $(n=4)$.For the $n$-th harmonic in a closed pipe,the number of nodes is $n$ and the number of antinodes is $n$.Since the third overtone corresponds to the $4$-th harmonic $(n=4)$,the air column in the pipe will have $4$ nodes and $4$ antinodes.

$A$ closed organ pipe (closed at one end) is excited to support the third overtone. It is found that air in the pipe has

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