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Energy Carried By Electromagnetic Waves

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 warmth. At other times, it is subtle, such as the unfelt energy of gamma rays, which can destroy living cells. Electromagnetic waves bring energy into a system through their electric and magnetic fields. These fields can exert forces and move charges in the system and, thus, do work on them. However, there is energy in an electromagnetic wave,...
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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Video Experimental Relacionado

Updated: Jul 12, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
06:28

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Published on: January 30, 2020

Estrellas binarias de rayos gamma de muy alta energía estrellas binarias de rayos gamma.

R C Lamb, T C Weekes

    Science (New York, N.Y.)
    |December 11, 1987
    PubMed
    Resumen

    Los astrónomos descubrieron binarios de rayos gamma de muy alta energía, sistemas con estrellas de neutrones que emiten una radiación poderosa. Estos hallazgos sugieren que fuentes galácticas similares pueden producir rayos cósmicos observados en la Tierra.

    Área de la Ciencia:

    • La astronomía y la astrofísica.
    • Astrofísica de alta energía Astrofísica de alta energía
    • Astronomía de rayos X La astronomía de rayos X es una ciencia.

    Sus antecedentes:

    • Los sistemas estelares binarios de rayos X luminosos, que emiten fotones de 0,1 a 10 kilovoltios de electrones, fueron un descubrimiento importante.
    • Observaciones recientes revelan que algunos de estos sistemas también emiten fotones por encima de 10~12 electronvoltios, lo que indica fenómenos de muy alta energía.

    Objetivo del estudio:

    • Para informar sobre el descubrimiento y las características de las binarias de rayos gamma de muy alta energía.
    • Para discutir las implicaciones de estos descubrimientos para la comprensión de los orígenes de los rayos cósmicos.

    Principales métodos:

    • Detección de emisión de rayos gamma de muy alta energía utilizando técnicas basadas en tierra.

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  • Observación de cuatro fuentes binarias específicas: Hércules X-1, 4U0115+63, Vela X-1 y Cygnus X-3 por grupos independientes.

    • Principales resultados:

    • Confirmación de la emisión de rayos gamma de muy alta energía de fuentes binarias que contienen estrellas de neutrones giratorias.
    • Observación de cuatro fuentes específicas (Hércules X-1, 4U0115+63, Vela X-1, Cygnus X-3) por múltiples grupos de investigación independientes.

    Conclusiones:

    • La existencia de binarios de rayos gamma de muy alta energía no se predijo inicialmente, pero ahora está respaldada por evidencia observacional.
    • Estas fuentes son posibles contribuyentes a la población de rayos cósmicos energéticos detectados en la Tierra, originados en fuentes galácticas similares en los últimos millones de años.