Editing Sine wave (section)

=== Standing waves ===
{{Main|Standing wave}}
When two waves with the same [[amplitude]] and [[frequency]] traveling in opposite directions [[superposition principle|superpose]] each other, then a [[standing wave]] pattern is created.

On a plucked string, the superimposing waves are the waves reflected from the fixed endpoints of the string. The string's [[resonant]] frequencies are the string's only possible standing waves, which only occur for wavelengths that are twice the string's length (corresponding to the [[fundamental frequency]]) and integer divisions of that (corresponding to higher harmonics).