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Commit e937aed0 authored by Claude Meny's avatar Claude Meny
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Update cheatsheet.en.md

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    12.temporary_ins/69.waves/10.n1/20.overview/cheatsheet.en.md
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    ...@@ -124,15 +124,15 @@ It’s called the *Kelvin wake*." ...@@ -124,15 +124,15 @@ It’s called the *Kelvin wake*."
    _Sometimes, all it takes is moving at the right speed for the world to draw you a path._ _Sometimes, all it takes is moving at the right speed for the world to draw you a path._
    !!! <details markdown=1><summary><strong>The Physicist's Eye</strong></summary> ! <details markdown=1><summary><strong>The Physicist's Eye</strong></summary>
    !
    A **wave** is a **disturbance in a medium created by a source** that **propagates in all directions** at the **speed of the wave**. ! A **wave** is a **disturbance in a medium created by a source** that **propagates in all directions** at the **speed of the wave**.
    !
    ---------- ! ----------
    !
    **The source is stationary in the medium** ! **The source is stationary in the medium**
    !
    ![](https://m3p2.com/fr/temporary_ins/waves/n2/overview/waves-doppler-immob_1ok_L900.gif) ! ![](https://m3p2.com/fr/temporary_ins/waves/n2/overview/waves-doppler-immob_1ok_L900.gif)
    ! !
    ! * Just as your voice disturbs the air and spreads in all directions, ! * Just as your voice disturbs the air and spreads in all directions,
    ! the duck disturbs the water, and circular ripples propagate across the water's surface, all centered on the duck. ! the duck disturbs the water, and circular ripples propagate across the water's surface, all centered on the duck.
    ......
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