“electromagnetic wave”的概念、定义、翻译、参考文献-科学参考

electromagnetic wave

Physics

See electromagnetic radiation; wave.

Mathematics

In a vacuum, an electromagnetic wave travels at the speed of light c. A monochromatic electromagnetic plane wave with angular frequency ω‎ has electric field

$E = a cos (ω (t - \frac{r \cdot e}{c})) + b cos (ω (t - \frac{r \cdot e}{c})) .$

Here e is a unit vector in the direction of the wave’s travel and r = (x,y,z). Further, a and b are perpendicular to e. The magnetic field is given by B = e × E/c. Then E and B satisfy Maxwell’s equations in a vacuum and also satisfy the wave equation.

Electronics and Electrical Engineering

See electromagnetic radiation.

Geology and Earth Sciences

A wave comprising an electrical and a magnetic component at right angles to one another but which are in phase and have the same frequency. The electrical component represents the electrical field strength, E, and the magnetic component the magnetic flux density, B. Electromagnetic waves travel at the speed of light (about 2.998 × 10⁵ km/s in free space), such that the wave velocity v = 1/(μ‎₀∊₀)^1/2, where μ‎₀ and ∊₀ are the magnetic permeability (4π‎ × 10⁻⁷ H/m) and dielectric permittivity of free space, respectively.

单词	electromagnetic wave
释义	electromagnetic wave Physics See electromagnetic radiation; wave. Mathematics In a vacuum, an electromagnetic wave travels at the speed of light c. A monochromatic electromagnetic plane wave with angular frequency ω‎ has electric field $E = a cos (ω (t - \frac{r \cdot e}{c})) + b cos (ω (t - \frac{r \cdot e}{c})) .$ Here e is a unit vector in the direction of the wave’s travel and r = (x,y,z). Further, a and b are perpendicular to e. The magnetic field is given by B = e × E/c. Then E and B satisfy Maxwell’s equations in a vacuum and also satisfy the wave equation. Electronics and Electrical Engineering See electromagnetic radiation. Geology and Earth Sciences A wave comprising an electrical and a magnetic component at right angles to one another but which are in phase and have the same frequency. The electrical component represents the electrical field strength, E, and the magnetic component the magnetic flux density, B. Electromagnetic waves travel at the speed of light (about 2.998 × 10⁵ km/s in free space), such that the wave velocity v = 1/(μ‎₀∊₀)^1/2, where μ‎₀ and ∊₀ are the magnetic permeability (4π‎ × 10⁻⁷ H/m) and dielectric permittivity of free space, respectively.
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