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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Momentum And Radiation Pressure01:20

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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.
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Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
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Electromagnetic Waves in Matter01:30

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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, or glass.
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Thermodynamic Background01:18

Thermodynamic Background

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The law of mass action states that "the rate of a chemical reaction is directly proportional to the product of the molar concentrations of the reactants." It means that the more 'active mass' or 'concentration' of the reactants present, the faster the reaction will proceed.In a chemical reaction, there are forward and reverse reactions. The forward reaction is the process where the reactants combine to form products. The reverse reaction is the process where the products break down to form the...
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Radiation: Applications01:17

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Updated: Mar 7, 2026

Carrier Lifetime Measurements in Semiconductors through the Microwave Photoconductivity Decay Method
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The Cosmic Microwave Background.

A W Jones1, A N Lasenby1

  • 1Milliard Radio Astronomy Observatory, Cavendish Laboratory, Madingley Road, Cambridge, CB3 OHE UK.

Living Reviews in Relativity
|February 14, 2017
PubMed
Summary
This summary is machine-generated.

This review covers cosmic microwave background (CMB) observations and theories, including inflationary theory and cosmological defects. New Bayesian analysis techniques and parameter constraints are presented.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Cosmic Microwave Background Radiation

Background:

  • The cosmic microwave background (CMB) is a fundamental observable in cosmology.
  • Understanding CMB anisotropies provides insights into the early universe and fundamental physics.

Purpose of the Study:

  • To review current theories and observations of the CMB.
  • To discuss new predictions for cosmological defect theories and inflationary theory.
  • To present new analysis techniques and parameter constraints using CMB data.

Main Methods:

  • Review of existing literature on CMB theory and observations.
  • Description of new predictions from cosmological defect and inflationary theories.
  • Analysis of recent CMB anisotropy data.
  • Application of Bayesian statistics for sky fluctuation reconstruction.
  • Maximum likelihood technique for cosmological parameter estimation.

Main Results:

  • Preliminary constraints on cosmological parameters (Ω and H₀) derived from CMB data.
  • Discussion of secondary anisotropies, including the Sunyaev-Zel'dovich effect.
  • Summary of proposed CMB experiments.

Conclusions:

  • CMB observations continue to refine our understanding of the universe.
  • Advanced statistical methods enhance the analysis of CMB data.
  • Future experiments promise further precision in cosmological measurements.