Longitudinal wave is a wave that has a vibration direction parallel to the direction of the wave creep slinki example is driven back and forth. When slinki driven forward-backward ¬ slinki then be formed on the density and stretched. One wavelength in the longitudinal wave is defined as the distance between two adjacent central density or the distance between two adjacent stretched center.
Pictured above is a spring that vibrated at the end. If we look at the picture above we can see that the direction of vibration in the direction of the waves, so-called longitudinal waves. A series of density and strain propagate along the spring. Density is the area where the coil spring toward each other, whereas strain is a region where the coil spring menjahui each other. If the wave form pattern tranversal have peaks and valleys, the longitudinal waves consisting of density and strain patterns. Wavelength is the distance between successive density or strain sequence. Is meant here is the distance of two points and the same sequence on the density or strain (see example in the picture above).
Lots of examples of longitudinal waves that occur in everyday life. One example is sound waves in air. Air as the medium of propagation of sound waves, close together and stretched along the direction of propagation of the air. Unlike the water waves or waves of string, sound waves can not we see the use of the eye. If someone likes listening to music, he's usually playing with a loud volume. If you have time try to see a loudspeaker. Note the movement of the loudspeaker, would move back and forth. It will result in vibration, and vibration that will result in air density and the strain causing the sound waves. We now know why the source of the sound must vibrate, because the vibration of air will form a longitudinal wave that will cause the sound waves.
formula of the second wave are:
V = λ . f
V = λ / T '
T = period of wave
V = fast wave propagation (m / s)
λ = wavelength (m)
f = frequency (Hz)