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Ondas Eletromagnéticas
Ondas Eletromagnéticas
James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his ...
Geração de Radiações Eletromagnéticas
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. ...
O Espectro Eletromagnético
Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as ...
Equação de Onda Eletromagnética
Maxwell's equations for electromagnetic fields are related to source charges, either static or moving. These fields act on a test charge, whose ...
Ondas Eletromagnéticas Planas I
The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of ...
Ondas Eletromagnéticas Planas II
Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between ...
Velocidade de Propagação de Ondas Eletromagnéticas
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
Consider a plane ...
Ondas Eletromagnéticas na Matéria
Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, ...
Energia Transportada por Ondas Eletromagnéticas
Anyone who has used a microwave oven knows there is energy in electromagnetic waves. Sometimes, this energy is obvious, such as in the summer sun's ...
Intensidade das Ondas Eletromagnéticas
The energy transport per unit area per unit time, or the Poynting vector, gives the energy flux of an electromagnetic wave at any specific time. For a ...
Momento e Pressão de Radiação
An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because ...
Pressão de Radiação: Resolução de Problemas
The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum ...
Ondas Eletromagnéticas Estacionárias
Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the ...
Ondas Estacionárias em uma Cavidade
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the ...
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