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Related Concept Videos

Modes of Standing Waves: II01:04

Modes of Standing Waves: II

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
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Modes of Standing Waves - I01:03

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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
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Standing Waves in a Cavity01:28

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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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Travelling Waves01:04

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A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
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The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
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Updated: Jul 27, 2025

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
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Whistler-mode chorus waves at Mars.

Shangchun Teng1,2,3, Yifan Wu1,2, Yuki Harada4

  • 1Deep Space Exploration Laboratory/School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China.

Nature Communications
|June 6, 2023
PubMed
Summary
This summary is machine-generated.

Chorus waves, space electromagnetic emissions, show a consistent chirping rate linked to magnetic field inhomogeneity. This finding validates a new generation model and aids in controlling plasma waves.

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Area of Science:

  • Space physics
  • Plasma physics
  • Electromagnetic waves

Background:

  • Chorus waves are natural space emissions producing energetic electrons in radiation belts.
  • Their fast frequency chirping mechanism is poorly understood.
  • The role of magnetic field inhomogeneity in chorus generation is debated.

Purpose of the Study:

  • To investigate the relationship between chorus wave chirping and background magnetic field inhomogeneity.
  • To test a new chorus generation model using observational data.

Main Methods:

  • Analysis of chorus wave observations from Mars and Earth.
  • Comparison of chirping rates with magnetic field inhomogeneity parameters.

Main Results:

  • Direct evidence confirms a consistent relationship between chorus chirping rate and magnetic field inhomogeneity.
  • This relationship holds despite significant differences in inhomogeneity parameters between planets.

Conclusions:

  • The study validates a recently proposed chorus generation model.
  • Confirms the crucial role of magnetic field inhomogeneity in chorus chirping.
  • Suggests potential for controlled plasma wave excitation in laboratory and space settings.