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  2. Electromagnetic radiation - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_radiation

    A monochromatic wave (a wave of a single frequency) consists of successive troughs and crests, and the distance between two adjacent crests or troughs is called the wavelength. Waves of the electromagnetic spectrum vary in size, from very long radio waves longer than a continent to very short gamma rays smaller than atom nuclei.

  3. Wireless power transfer - Wikipedia

    en.wikipedia.org/wiki/Wireless_power_transfer

    Wireless power transfer (WPT; also wireless energy transmission or WET) is the transmission of electrical energy without wires as a physical link. In a wireless power transmission system, an electrically powered transmitter device generates a time-varying electromagnetic field that transmits power across space to a receiver device; the receiver ...

  4. Radiative transfer - Wikipedia

    en.wikipedia.org/wiki/Radiative_transfer

    Radiative transfer (also called radiation transport) is the physical phenomenon of energy transfer in the form of electromagnetic radiation. The propagation of radiation through a medium is affected by absorption , emission , and scattering processes.

  5. Standing wave - Wikipedia

    en.wikipedia.org/wiki/Standing_wave

    A pure standing wave does not transfer energy from the source to the destination. [29] However, the wave is still subject to losses in the medium. Such losses will manifest as a finite SWR, indicating a travelling wave component leaving the source to supply the losses.

  6. Thermal radiation - Wikipedia

    en.wikipedia.org/wiki/Thermal_radiation

    Radiation waves may travel in unusual patterns compared to conduction heat flow. Radiation allows waves to travel from a heated body through a cold non-absorbing or partially absorbing medium and reach a warmer body again. [14] An example is the case of the radiation waves that travel from the Sun to the Earth.

  7. Heat transfer - Wikipedia

    en.wikipedia.org/wiki/Heat_transfer

    Radiative heat transfer is the transfer of energy via thermal radiation, i.e., electromagnetic waves. [1] It occurs across vacuum or any transparent medium ( solid or fluid or gas ). [ 15 ] Thermal radiation is emitted by all objects at temperatures above absolute zero , due to random movements of atoms and molecules in matter.

  8. Transverse wave - Wikipedia

    en.wikipedia.org/wiki/Transverse_wave

    Mathematically, the simplest kind of transverse wave is a plane linearly polarized sinusoidal one. "Plane" here means that the direction of propagation is unchanging and the same over the whole medium; "linearly polarized" means that the direction of displacement too is unchanging and the same over the whole medium; and the magnitude of the displacement is a sinusoidal function only of time ...

  9. Mechanical wave - Wikipedia

    en.wikipedia.org/wiki/Mechanical_wave

    Like all waves, mechanical waves transport energy. This energy propagates in the same direction as the wave. A wave requires an initial energy input; once this initial energy is added, the wave travels through the medium until all its energy is transferred. In contrast, electromagnetic waves require no medium, but can still travel through one.