Physics - Sound Wave Question with Solution | TestHub

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

In the fundamental mode (zeroth overtone), there is $1$ node and $1$ antinode.

In the $p$-th overtone, the number of nodes is $p+1$ and the number of antinodes is $p+1$.

For the second overtone, $p=2$.

Number of nodes = $2+1=3$

Number of antinodes = $2+1=3$

Thus, the air column has three nodes and three antinodes.

Answer: three nodes and three antinodes.