Physics - Sound Wave Question with Solution | TestHub

For a closed organ pipe, the closed end is always a node and the open end is always an antinode.

In the fundamental mode (first harmonic), the length of the pipe is $L=\frac{\lambda }{4}$. It has $1$ node and $1$ antinode.

In the first overtone (third harmonic), $L=\frac{3\lambda }{4}$. It has $2$ nodes and $2$ antinodes.

In the second overtone (fifth harmonic), $L=\frac{5\lambda }{4}$. The wave pattern consists of $3$ nodes and $3$ antinodes.

Answer: three nodes and three antinodes.