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Videos de Conceptos Relacionados

Momentum And Radiation Pressure01:20

Momentum And Radiation Pressure

An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container. Nichols...
Radiation Pressure: Problem Solving01:09

Radiation Pressure: Problem Solving

The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...
Scanning Electron Microscopy01:07

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Interaction of EM Radiation with Matter: Spectroscopy01:12

Interaction of EM Radiation with Matter: Spectroscopy

Electromagnetic (EM) radiation can be considered an oscillating electric and magnetic field propagating through a medium that can interact with matter in its path. The electric field in the radiation can interact with electrical charges in the atoms or molecules in the matter. On the other hand, the magnetic field can interact with the magnetic field in the atomic nucleus. The study of the interaction between electromagnetic radiation and matter is termed spectroscopy. Spectroscopy is the study...

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The infrared spectrum of comet Bradfield (1987s) and the silicate emission feature.

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Updated: Jul 11, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

El cometa oeste y la función de dispersión del polvo cometario.

E P Ney, K M Merrill

    Science (New York, N.Y.)
    |December 3, 1976
    PubMed
    Resumen

    Los investigadores estudiaron las propiedades del polvo del cometa West utilizando observaciones infrarrojas. Las partículas de polvo son probablemente granos dieléctricos de 1 micrón, con propiedades de dispersión hacia adelante que indican su tamaño y composición.

    Área de la Ciencia:

    • Ciencia de los Cometas Ciencia de los Cometas
    • Física del polvo Física del polvo
    • Astronomía por infrarrojos Astronomía por infrarrojos

    Sus antecedentes:

    • El polvo cometario juega un papel crucial en la comprensión de la formación del sistema solar.
    • Estudios anteriores han caracterizado la composición del polvo cometario y la distribución del tamaño.
    • El cometa West (1975n) ofrece una oportunidad única para estudiar las propiedades del polvo.

    Objetivo del estudio:

    • Para determinar la función de la fase de dispersión del polvo en el cometa West.
    • Para inferir el tamaño y la composición de las partículas de polvo cometario.
    • Para correlacionar el comportamiento del polvo con los eventos de fragmentación cometaria.

    Principales métodos:

    • Observaciones infrarrojas del cometa West a través de longitudes de onda de 0.5 a 18 micras.

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  • Análisis de la luz dispersa y la emisión térmica del coma cometario.
  • Modelado de la función de la fase de dispersión basada en datos de observación.

    • Principales resultados:

    • La función de la fase de dispersión del polvo del cometa West tiene un pico fuerte en la dirección delantera.
    • Las partículas de polvo se identifican como granos dieléctricos con radios de alrededor de 1 micrón.
    • Los aumentos repentinos en el brillo del coma se correlacionan con los tiempos de fragmentación predichos del cometa.

    Conclusiones:

    • Las partículas de polvo cometario en el cometa West exhiben propiedades de dispersión hacia adelante consistentes con los granos dieléctricos de 1 micrón.
    • Las variaciones de brillo observadas sugieren que los eventos de fragmentación influyeron en la liberación de polvo y las propiedades de coma.
    • Este estudio mejora nuestra comprensión de la dinámica y evolución del polvo cometario.