xkcd #3158: Shielding Chart

a year ago by xkcd bot to c/xkcd

xkcd #3158: Shielding Chart

Title text:

Sharks can occasionally travel short distances through air when pursuing prey, but their attenuation coefficient is pretty high.

Transcript:

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Source: https://xkcd.com/3158/

explainxkcd for #3158

ludrol 19 points a year ago

the demon core for neutron source is funny

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jawa22 13 points a year ago

This is the best one in quite a while imo.

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LawfulPirate 10 points a year ago

Lead/Water type has pretty good defensive coverage but sound and heat might be dominant

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Landless2029 3 points a year ago

Am I wierd for wanting a poster of this?

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RebekahWSD 1 point a year ago

Not weird at all! It would be a good poster!

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Zoomboingding 2 points a year ago

Armor would block radio waves?

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Linen04 2 points a year ago

Yes, a complete set of metal armor would work as Faraday cage

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muzzle 2 points a year ago

Neutrinos are sorely missing

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Devjavu 1 point a year ago

Why does the faraday cage not have a gray, but a purple? I thought it completely blocks radio.

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Scirocco 2 points a year ago

It depends on the wavelength of the radio waves.

This is visible in microwaves, where the wavelength is about 12cm, but the tiny holes of 1mm are small enough that zero (or super tiny?) radiation/radio/EM in that wavelength can pass through, but light (visible light that you can see) has a much, much smaller wavelength and passes just fine.

So, you could say that a larger mesh (chain link fence?) of conductive material is also a faraday cage, but only affects things with a really large wavelength.

thus, faraday cages have a variable effect, depending on their configuration.

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Devjavu 1 point a year ago

Yeah, I did read some time ago that the max hole size was like half the wavelength and there existed also a penetration depth. I guess this makes sense with light making it through fences.

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mEEGal 1 point a year ago

Heat ç sound are the hardest to block

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