this post was submitted on 12 Sep 2025
277 points (99.3% liked)

xkcd

13114 readers
240 users here now

A community for a webcomic of romance, sarcasm, math, and language.

founded 2 years ago
MODERATORS
 

xkcd #3141: Mantle Model

Title text:

Mantle plumes explain Hawaii, Yellowstone, Iceland, the East African Rift, the Adirondack uplift, the Permian extinction, the decline of Rome, the DB Cooper hijacking, and the balrog in Moria. Those little hills of sand in your yard are caused by antle plumes.

Transcript:

Transcript will show once it’s been added to explainxkcd.com

Source: https://xkcd.com/3141/

explainxkcd for #3141

you are viewing a single comment's thread
view the rest of the comments
[–] panda_abyss@lemmy.ca 15 points 1 week ago (12 children)

This is how I feel about the double slit experiment.

Lights not a wave and a particle depending on whether you observe it. Something else is going on, that’s bullshit.

[–] OboTheHobo@ttrpg.network 46 points 1 week ago* (last edited 1 week ago) (4 children)

Ehh, its a bit more than that.

Its a particle in that we know they are quantized into single photons. As in, it is impossible to observe half of a photon, or any non-integer number of photons, and one photon can only be observed in one place. This makes it like a particle.

But its a wave in the way it behaves - it can interfere (not just with other photons, with itself), and its movement can only be described through wave functions that can even take seperate paths at the same time, according to how waves propogate.

And, there are ways in which they act like particles no matter how they are observed, and same for wavelike behavior

Worth noting: "observation" is just physical measurement. You have to keep in mind that observing something fundamentally requires interacting with it - in order to look at an apple, photons must bounce off of it, which is a physical interaction. On the quantum scale, these interactions cannot be ignored.

Also also: this isn't just photons, everything is like this. It may not align with how we observe things on a macroscopic scale, but this is fundamentally how the universe works.

[–] Cocodapuf@lemmy.world 3 points 1 week ago* (last edited 1 week ago) (3 children)

Also also: this isn't just photons, everything is like this. It may not align with how we observe things on a microscopic scale, but this is fundamentally how the universe works.

Wow, I think this answered my question before I asked it. So yeah, I was wondering about that double slit experiment, I've seen it demonstrated with photons and visible light, but do the principles demonstrated by the experiment actually apply to other particles? In the right environments, do atoms behave similarly?

[–] vithigar@lemmy.ca 3 points 1 week ago (1 children)

In theory yes, but once you have multiple particles interacting things get really complicated really fast and nice tidy interference patterns like in the double slit experiment become much less common.

All atoms are multiple particles at quantum scales, even a single hydrogen atom is comprised of four.

[–] Cocodapuf@lemmy.world 1 points 1 week ago

All atoms are multiple particles at quantum scales, even a single hydrogen atom is comprised of four.

And I imagine we don't have great methods for manipulating subatomic particles... Quarks and such don't have magnetic charges, they're probably hard to control as well as probably unstable on their own. So as a result I'd wager it's hard to run experiments with those.

load more comments (1 replies)
load more comments (1 replies)
load more comments (8 replies)