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Joined 1 year ago
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Cake day: July 8th, 2023

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  • DaddleDew@lemmy.worldtoScience Memes@mander.xyzWhales
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    8 hours ago

    As sound travels through a water layer where the speed through which it travels varies with depth, the sound will tend to refract towards where it is the slowest.

    A layer where temperature decreases as depth increases will refract sound downwards. A layer that has the inverse temperature properties will do the opposite. A layer that is isothermal (where the temperature remains constant as depth changes), will still tend to refract sound upwards because the increase in pressure also increases velocity, although not as strongly as temperature does, which is why temperature differences can easily overcome this effect where the water is not isothermal.

    If you have a layer that refracts sound downwards on top of a layer that refracts sound upwards, you just created a sound channel, which acts as a wave guide in which sound will remain trapped and travel far longer distances horizontally before dissipating.

    Ultimately you can’t really put a number on the required temperature differences because there are many other factors to take into account like how steeply the speed of sound changes, how tall the layer(s) are, what is the frequency of the sound, or how much of it you want to remain “trapped” in the sound channel.



  • DaddleDew@lemmy.worldtoScience Memes@mander.xyzWhales
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    20 hours ago

    How well sound propagates through water is highly dependent on the water temperature variations over depth. There can be conditions in which sounds can be trapped between two different horizontal “layers” and travel far greater distances than 80km.








  • I didn’t wait. I did it earlier this year and haven’t booted from my Windows 10 drive since then. My entry drug was Linux Mint. But I quickly switched to OpenSUSE Tumbleweed after because I wanted something that ran the KDE Plasma 6 desktop environment (I prefer how it looks and handles multiple displays). It isn’t that hard to learn the basics you need to use Linux, as long as you use a decently stable distro that you won’t need to troubleshoot at every update. In my limited experience, you only need more in depth knowledge when you try messing around with more “cutting edge” and less “stable” distros and are installing experimental features.

    I can’t believe that Microsoft is expecting everyone to get rid of their computer to switch to 11 once the support for 10 expires next year. I even revived an 15 year old laptop that only had 4Gb or RAM by installing Mint on it (and switching its HDD with an SSD I had kicking around). It’s fast and perfectly usable for everything but modern games now