The momentary distance x of a point P (on a curve or a straight line) from its rest position is referred to as deflection or elongation of an oscillation .
The greatest deflection is called the amplitude and is indicated by the mathematical symbol as the maximum value.
For example, the amplitude of the sound displacement ξ (Greek Xi ) of a harmonic oscillation is :
Horst Stöcker : Pocket book of physics. 4th corrected edition. Verlag Harry Deutsch, Frankfurt am Main et al. 2000, ISBN 3-8171-1628-4 .
- Horst Kuchling: Pocket book of physics. 4th edition. Verlag Harry Deutsch, Frankfurt am Main et al. 1982, ISBN 3-87144-097-3 .