Question

equation of stationary wave and terminology of the equation?

Answer 1

What Is a Standing Wave?
Imagine plucking a string on a guitar or blowing into a whistle. In both situations, you are creating vibrations, also known as mechanical waves, within the body of the instrument. The vibrating instrument creates sound that your ears detect after energy from the vibration (in the form of a sound wave) travels through the air to your ear. The vibrations that are created within the instrument itself are known specifically as standing waves.

A standing wave is a particular kind of wave that can only be created when a wave's motion is restricted to a finite region. To understand exactly what this means, let's focus on a vibrating guitar string. The guitar string's motion is restricted on both ends of the string: on the fretboard by your finger on one side and by the bridge on the other side, where it attaches to the body of the guitar. When the string is plucked, the wave reflects off each of these boundaries. The wave's energy quickly spreads out as it repeatedly moves back and forth between the two ends of the string. Through a complicated process of interference, standing waves are produced.