Kamis, 29 September 2011

Longitudinal Waves


A. Longitudinal waves

            Longitudinal wave is a wave that has a vibration direction parallel to the direction of the wave rambatnya slinki example is driven back and forth. When slinki driven forward-backward ¬ slinki then the density will be formed and renggangan. One wavelength in the longitudinal wave is defined as the distance between two adjacent central density or the distance between two adjacent renggangan centers.

            The formula of the second wave are:
F V = λ V = λ / T
'Remarks:
T = wave period
V = fast wave propagation (m / s)
λ = wavelength (m)
f = frequency (Hz)
           The wavelength of longitudinal waves. Because of the length density and renggangan not the same, then should we define the wavelength in terms of central density and central renggangan. In longitudinal waves, one wave () consists of a density and a renggangan.

'Example Problem:
  A slinki generate longitudinal waves with the distance between the central density and central renggangan adjacent 20 cm. If the wave frequency of 60 Hz, determine the longitudinal wave propagation is fast.

Answer:
Density and the distance between the centers of adjacent renggangan center equal to half wavelength (½ λ). Thus,
             ½ λ = 20 cm
                 λ = 40 cm = 0.4 m
                 f = 60 Hz
Fast wave propagation is calculated with Equation (1-2)
                 v = λf = (0.4 m) (60 Hz) = 24 m / s = 2400 cm / s

             Wavelength is defined as the distance between two adjacent central density or the distance between two adjacent centers renggangan. The distance between the centers of adjacent renggangan density and is half the wavelength or ½ λ.

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