Schallwelle
đ Schwingende Luftteilchen, die sich als Welle ausbreiten
Basiswissen
Eine Welle im physikalischen Sinn ist die rĂ€umliche Ausbreitung einer Schwingung. Bei einer Schallwelle schwingen Atome oder MolekĂŒle von Luft, FlĂŒssigkeiten oder Feststoffen. Die Teilchen schwingen dabei in Richtung der Schallausbreitung hin und her, man spricht von einer sogenannten Longitudinalwelle â
FuĂnoten
- [1] Eine frĂŒhe Theorie der Schallwellen stammt von dem niederlĂ€ndischen Physiker Christiaan Huygens (1629 bis 1695): "As regards the different modes in which I have said the movements of Sound and of Light are communicated, one may sufficiently comprehend how this occurs in the case of Sound if one considers that the air is of such a nature that it can be compressed and reduced to a much smaller space than that which it ordinarily occupies. And in proportion as it is compressed the more does it exert an effort to regain its volume; for this property along with its penetrability, which remains notwithstanding its compression, seems to prove that it is made up of small bodies which float about and which are agitated very rapidly in the ethereal matter composed of much smaller parts. So that the cause of the spreading of Sound is the effort which these little bodies make in collisions with one another, to regain freedom when they are a little more squeezed together in the circuit of these waves than elsewhere." In: TREATISE ON LIGHT In which are explained The causes of that which occurs In REFLEXION, & in REFRACTION And particularly In the strange REFRACTION OF ICELAND CRYSTAL. By CHRISTIAAN HUYGENS. Rendered into English By SILVANUS P. THOMPSON. Dort die Seite 12. Im Französischen Original: Traite de la Lumiere. 1690. Huygens Schall-Theorie ist eingebettet in einer Suche nach dem Stoff, in dem die Wellen von Licht sich ausbreiten. Siehe dazu auch LichtĂ€ther â