Energy - Intensity and Absorption of a wave

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Introduction


The singularity of physics in the branch of kinetics is interested in studying what refers to harmonic vibratory movement, such as that where it is evident that the particles oscillate around an equilibrium point in a constant period of time, in terms of the wave phenomenon , this consists of the propagation of a disturbance of some property of space, for example, density, pressure, electric field or magnetic field, implying a transport of energy without transport of matter, that is why waves need a material medium to propagate depending on the medium: air, water, sound. In the field of physics, the wave phenomena that are studied, which can be evidenced in propagating, which in turn produces in the middle, a harmonic movement represented by functions, an example is the Furier teorem, shows that any wave movement, this is a sine wave composition.


For this case, the characteristics of the wave motion are considered as a reader friend, it is the energy transfer, the mechanical energy that is transported making possible a potential sum is also assumed, it is also null when it is exerted in a kinetic way when the particle in action its speed is maximum, that is why the intensity of the energy wave that passes through the unit of the surface, is placed perpendicular to the direction of propagation exerted in a unit of time. When two or more waves propagate in a medium, the elongation, so to speak, will have a resultant of expenditures of each of the waves separately, considering that each of them propagates in the same initial way.

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v(max)= A×ᦍ times the total energy of the particle.

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Now, for the case of spherical shape, the following is assumed, the number of wavelengths at K = 2 (π / λ), which represents the distance traveled in 2xπ, in order to substitute in the mother equation, considering the form that is propagates the wave in a positive direction along the axis of the abscissa, remember that it can rotate and in the opposite direction we are left with: Y (x, t) = A sin ((ᦍ. t) + (Kx)).

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Now, on the wave front, it will be with spherical characteristics, since the energy that passes through a surface of radio R1, should be the same that passes through the other radio wave R2.


We have then:

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The intensity is inversely proportional to the square of the distance from the emitting center, also of the square of the amplitude and the distance of the focus.


For the case of a linear wave, it is evident that all the energy emitted will pass through all the points in the middle, where it shows us that the intensity is independent of the distance to the point of the disturbance, but the most singular Of all this, dear reader, there is no perfectly elastic medium, so to speak, it causes it to lose energy and its intensity, where 𝞫 represents the absorption constant, which depends on the medium that the wave passes through, dI represents the material, dI = -𝞫 × I × dx, where the sign indicates the decrease.

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[1]- General Physics by Santiago Burbano, 2003.


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