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Related Concept Videos

Detection of Black Holes01:10

Detection of Black Holes

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Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
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Doppler Effect - II01:05

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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Doppler Effect - I00:56

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The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
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Galvanometer01:25

Galvanometer

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Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
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Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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Standing Electromagnetic Waves01:15

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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
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Related Experiment Video

Updated: Jul 30, 2025

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Damage sidelines Virgo gravitational wave detector.

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    |May 18, 2023
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    Summary

    The search for gravitational wave sources is ongoing with the twin LIGO detectors. Current limitations restrict the science reach of these astronomical observations.

    Area of Science:

    • Astronomy and Astrophysics
    • Gravitational Wave Astronomy

    Background:

    • The Laser Interferometer Gravitational-Wave Observatory (LIGO) is resuming its search for cosmic events.
    • The current observing run utilizes only the two terrestrial LIGO detectors.

    Discussion:

    • The limited number of detectors impacts the sensitivity and localization capabilities for gravitational wave events.
    • This constraint affects the scope of astrophysical phenomena that can be studied.

    Key Insights:

    • The twin LIGO detectors are operational, continuing the quest for new gravitational wave signals.
    • The current configuration presents challenges for achieving broad scientific discovery.

    Outlook:

    • Future observing runs with enhanced detector networks are anticipated to expand scientific reach.

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  • Technological advancements aim to improve sensitivity and broaden the detection capabilities for gravitational waves.