The wave pattern on a stretched string is shown in figure . Interpret what kind of wave this is and find its wavelength

Explanation

From the given figure, we observe that points at x = 0, 10, 20, 30 and 40 are nodes. So it represents a stationary wave.
Since
Distance between two successive nodes `= (lambda)/(2)`
`therefore " "lambda = 2` (node to node distance)
or `lambda = 2 (20 - 10)`
`lambda = 20` cm