Wave Motion
call wave to the transmission of a perturbation of a pto. to another without a net transport of matter. Waves can be classified: a) according to the direction of propagation: one-dimensional waves: those that propagate in one direction.
Bidimendionales waves: those that propagate in both directions.
Theorem conservation of mechanical energy
We know if W = A · Ec if the forces acting are conservative then AW =- W =- (ub wa) work = - e. potential, we equate the equations ..
Mechanical energy
His name is E. mechanics to the sum of Ec and potential above expression tells us that when the forces acting on a body are conservative E. mechanism remains Cte.
Longitudinal waves
Are those in which the direction of propagation coincides with the disturbance by transmitting such a spring to compress and release him.
Three-dimensional waves
Cunado the wave propagates in the 3 directions.
According to the means by which they spread:
Matter Waves
Waves are those that need a material medium to propagate. The rate of spread is in a working demo of the characteristics of the medium.
Electromagnetic waves
Are those that do not require a material medium to propagate in a vacuum do such visible light.
According to the direction in which the disturbance occurs
Transverse waves
Are those in which the propagation direction is perpendicular to the disturbance.
WEAKENING OF THE WAVES TO SPREAD
A wave weakens as it propagates from the source emitter resulting in a decrease of its intensity. If it is a harmonic wave propagating in homogeneous and isotropic half the intensity dismunicion is a dsiminucion amplitude of the wave. The cause of the decrease can be of two types of attenuation and absorption.
Viscosity
It is the resistance of fluids flowing.
Top huygeus
The intensity decreases exponentially with the distance traveled THROUGH the medium. Every point of a wavefront becomes a point source of secondary wavelets, the same speed and frequency as the initial wave envelope whose surface is a new wavefront.
Principle of superposition
Cunado 2 or more waves that propagate through 1 half are found, the resulting disturbance at each point of the medium is equal to the sum of the shocks would produce each of them separately.