Chapter 33
Electromagnetic Waves
Onde elettromagnetiche
James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his ...
Generazione di radiazioni elettromagnetiche
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. ...
Lo spettro elettromagnetico
Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as ...
Equazione delle onde elettromagnetiche
Maxwell's equations for electromagnetic fields are related to source charges, either static or moving. These fields act on a test charge, whose ...
Onde elettromagnetiche piane I
The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of ...
Onde elettromagnetiche piane II
Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between ...
Velocità di propagazione delle onde elettromagnetiche
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
Consider a plane ...
Onde elettromagnetiche nella materia
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 trasportata dalle onde elettromagnetiche
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 ...
Intensità Delle Onde Elettromagnetiche
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 ...
Quantità di moto e pressione di radiazione
An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because ...
Pressione di radiazione: risoluzione dei problemi
The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum ...
Onde elettromagnetiche stazionarie
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 ...
Onde stazionarie in una cavità
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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