FE Physics
 Formulas & Explanation
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Travelling waves

A periodic wave is a periodic disturbance that moves through a medium.

The vibration of the source is transmitted to other particles.

The particles of the rope (or spring) perform the same movement after another.

Amplitude is equal for all particles as the wave is undamped

All particles vibrate with the same frequency


Wave length :

a.           smallest distance between pairs of corresponding point on the wave train  

b.      distance that the wave moves in 1 periodic time


Transverse waves  :    direction of the particles in periodic motion perpendicular to the            

                                        direction in which the waves travel        



















                                       Example :  simple harmonic motion travels in a rope. 

                                                           the rope  takes the form of a sine

                                                           wavelength: length of 1 sine 
















Longitudinal waves: direction periodic motion of the particles is the same

                                           direction in which the waves travel. 
















 Example:  wave travels in air

                                     There are  condensations and rarefractions

                                  wavelenght : distance between the centers of two successive  

                                                            condensations /rarefractions






















There is:

v = f . λ                    v speed of the wave  in m/s

                                   f frequency source in Hz

                                   λ wavelength  in m


Δ φ = Δ x/ λ           Δ x  distance between two points in a wave

                          Δ φ  phase difference between these two points       

                           λ and  Δ x : the same unit