PHYSICS ARTICLES
A. Understanding Waves:
Is a form of vibration waves that crept in a medium. On the propagating waves are waves, not the substance of medium instrumentality. One wave length can be seen by calculating the distance between the valleys and hills (analyze the transversal wave) or the distance between a density menhitung with one renggangan (longitudinal wave). Fast wave propagation is the distance traveled by a wave in one second.
B. Types of Waves:
1. Transverse wave
Transverse waves are waves which direction perpendicular to the direction rambatannya rambatannya. A wave consists of a valley and a hill, such as wavelength of water, which vibrated yarn, etc..
2. Longitudinal wave
Logitudinal waves are waves which propagate in the direction coincident with the direction of vibration on each part of the existing. Wave that occurred in the form of density and renggangan. Examples of such longitudinal waves slingki / spring that is pulled to the side and then released.
Longitudinal wave is a wave that has a vibration direction parallel to the direction rambatnya example is the wave of slinki driven back and forth. When moved forward slinki ¬ Mundu-then the density and slinki renggangan will be formed as shown in Figure 5. One wavelength at the longitudinal wave is defined as the distance between two adjacent central density or the distance between two adjacent centers renggangan.
The formula of the second wave include the following:
V V = λ f = λ / T
'
Description:
T = wave period
V = wave propagation speed (m / s)
λ = wavelength (m)
f = wave frequency (Hz) Examples of longitudinal waves: wave - slinki tied at both ends on the stative is then supplied to one end harassment
- Waves of sound in air
1. Wavelength
A. Wavelength Definition
One wave length equal to the distance traveled in one period.
1) The wavelength of a transverse wave
In a transverse wave, a wave consisting of three nodes and two stomachs. The distance between two nodes or two successive stomach is called a half wave length or ½  (lambda).
2) The wavelength of longitudinal waves
Consider the following illustration!
B. Quick Potatoes Waves
Distance traveled by a wave in one second is called propagation of waves. Fast wave propagation is denoted by v and its units m / s or m s-1. The relationship between v, f, , and T are as follows:
Description:
 (lamda) = wavelength, unit meter (m)
v = velocity of wave propagation, unit meters / second (ms-1)
T = wave period, the unit seconds or seconds (s)
f = frequency wave, unit or 1/sekon 1/detik (s-1)
2. Wave Reflection
If the wave through a barrier or barriers, such as solids, then the wave will be reflected. This reflection is one of the properties of the wave.
Example Problem:
1. In a second wave generated as the image below
a. what is the frequency of these waves?
b. When the distance PQ = 2 cm, then what is?
Completion:
According to the drawings, a wave that occurred as much as two waves. Mean, f = 2 wave / second or f = 2 Hz.
In the image occurs two waves (2 ). So two  = 2 cm or  = 1 cm.
2. A string whose length is 8 m stretch and then vibrated. During the second wave of second place as in the picture below!  Define, f, T, and v.
Completion:
From the image occurs as many as four  waves.
Means: 4  = 8 m so  = 8 / 4 = 2 m
During the two second place four   or during the first occurred two  seconds.
So, f = 2 wave / second or f = 2 Hz
T = 1 / f = ½ seconds so that v =   f = 2 mx 2 Hz = 4 m s-1