Standing waves in closed tubes (video)
With a neat labelled diagram, show that all harmonics are present in an air column contained in a pipe open at both the ends. Define end correction.
Why is distance between two successive nodes equal to $\frac{1}{2} \lambda$ in standing wave
1st PUC Physics Question Bank Chapter 15 Waves
And of course, if two nodes are added to the pattern, then two antinodes must be added as well in order to maintain an alternating pattern of nodes and antinodes.
Solution : Let v be the velocity of sound in the given medium.
Hence, this distance is called the end-correction.