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Sign language is just radio communication but on another frequency

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wipasoda@lemmy.world
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showerthoughts@lemmy.world
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Because you use light to communicate in sign language, and light is just an electromagnetic wave like radio but on another frequency. You just need to be in line of sight

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jonatan83@lemmy.fmhy.ml
3 points

That’s just what the acronym means, it doesn’t describes the actual process. I don’t think there is a single RADAR that doesn’t have a transmitter. At that point it would just be a… radio.

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Atrabiliousaurus@lemmy.world
18 points
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jonatan83@lemmy.fmhy.ml
2 points

Fair enough, though I would argue that’s a very specific subtype of radar and anyone saying “radar” refers to the type that is used in 99.999% of the cases.

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Atrabiliousaurus@lemmy.world
3 points

Yeah probably true. I only thought to look it up because I knew active and passive sonar was a thing.

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