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21 lis 2023 · A compression wave is a where the movement of the medium, or the vibration/disturbance within the medium, is in the same, or parallel, direction as that of the motion of the wave.
Sound in air results when air is suddenly compressed, for example by a moving surface (such as a vibrating vocal cord or bell). The compression pushes against adjacent air, and that pushes against the air in front of it, and so on. The amazing thing about sound is that the disturbance travels, and the shaking of the original air stops.
There are water waves, waves on strings, sound waves, (a) x^. earthquake waves, radio waves, light waves, radar waves, X-rays, etc. In the present unit we shall discuss the most basic properties common to all kinds of waves. We shall then use the next several units to explore.
Longitudinal waves show areas of compression and rarefaction. Waves can be reflected, refracted and diffracted. Significant diffraction only occurs when the wavelength of the wave is of the same order of magnitude as the size of the gap or obstacle. Waves undergo a change of direction when they are refracted at an interface. Waves are
Longitudinal waves are sometimes called compression waves or compressional waves, and transverse waves are sometimes called shear waves.
If the piston is made to oscillate sinusoidally (see section 2 of this paper), regions of compression are set up in the gas. The distance between two successive compressions equals the wavelength λ of the wave.
Sound waves are longitudinal waves of compression and rarefaction in which the air molecules move back and forth parallel to the direction of wave travel centered on an average position, resulting in no net movement of the molecules. When these waves strike another object, they cause that object to vibrate by exerting a force on them.
