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Related Concept Videos

Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Shock Waves01:16

Shock Waves

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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
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Travelling Waves01:04

Travelling Waves

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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.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is...
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Standing Waves01:17

Standing Waves

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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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Kinetic and Potential Energy of a Wave01:10

Kinetic and Potential Energy of a Wave

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All forms of waves carry energy; this is directly visualized in nature. For instance, the waves of earthquakes are so intense that they can shake huge concrete buildings, causing them to fall. Loud sounds can damage nerve cells in the inner ear, causing permanent hearing loss. The waves of the oceans can erode beaches. 
In mechanical waves, the amount of energy is related to their amplitude and frequency. In the context of the above examples, large-amplitude earthquakes produce large...
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Energy and Power of a Wave00:58

Energy and Power of a Wave

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The total energy associated with a wavelength is the sum of the potential energy and the kinetic energy. The average rate of energy transfer associated with a wave is called its power, which is total energy divided by the time it takes to transfer the energy. For a sinusoidal wave, energy and power are proportional to the square of both the amplitude and the angular frequency.
Waves can also be concentrated or spread out, as characterized by the intensity of the wave. Intensity is directly...
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Developing a Virtual Reality Video Game to Simulate Rip Currents
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The next big wave is coming.

Michael Le Page

    New Scientist (1971)
    |April 4, 2022
    PubMed
    Summary

    COVID-19 cases are rising rapidly. China faces a significant public health crisis if this major outbreak is not quickly contained.

    Area of Science:

    • Epidemiology
    • Public Health

    Background:

    • The global landscape of COVID-19 transmission is dynamic, with resurgence in various regions.
    • China is experiencing its most substantial outbreak since 2020, posing unique public health challenges.

    Purpose of the Study:

    • To assess the current trajectory of COVID-19 cases.
    • To evaluate the potential public health implications for China.

    Main Methods:

    • Monitoring of reported COVID-19 case numbers.
    • Analysis of outbreak trends and containment strategies.

    Main Results:

    • A sharp increase in COVID-19 cases is observed globally.
    • China's current outbreak is the largest since 2020.

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    Conclusions:

    • Urgent and effective containment measures are critical for China to avert a potential public health disaster.
    • The global community must remain vigilant regarding evolving COVID-19 dynamics.