Vibrating String

When we turned the knob clockwise, the string vibrated faster. Turning the knob counterclockwise causes the string to vibrate slowly.
The waves produced when the strings vibrated fast are shorter. Conversely, the waves produced by slow vibrating string are longer. The waves going out along the string and the reflected waves coming back combined to make a large motion of the string at some places and cancelled each other at the point called “nodes.”