Everything posted by swansont
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Corona virus general questions mega thread
But you haven’t actually done that. If you have a false negative, and the ones with the virus who have mistakenly been cleared will be able to more easily pass the virus along. OK, I was taking “a set of 7 samples” to mean you test 7 people. Still, the false negatives will be amplified, and testing needs to be more sensitive to come up positive since they’re diluted, as J. C. has pointed out.
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Corona virus general questions mega thread
How does a 1% probability apply? Is that based on anything valid? How have you eliminated anyone you haven’t tested?
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Banned/Suspended Users
Peter Dow has been suspended for soapboxing (basically treating the site as if it were his blog) and ignoring rule 2.7 — posting to advertise personal sites
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Corona virus general questions mega thread
The flu can be worse, but not for all strains, and we develop vaccines for the strains expected to be problematic each year. Less is known about the coronavirus, and we don't (yet) have a vaccine for COVID-19.
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Implications of movie physics
It’s lit from inside the cabin.
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Why is the earth at an angle?
It may wobble less, but it wobbles. The direction of the north pole (rotational axis) is not fixed. https://en.wikipedia.org/wiki/Polar_motion
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Banned/Suspended Users
Schmelzer has been suspended for hijacking/spamming his pet theory all over the forums
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Classical vs. Quantum Harmonic Oscillator (split)
Yes, although they will behave differently. The wavelength of a particle is h/p
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Classical vs. Quantum Harmonic Oscillator (split)
Yes. If by "trap" you mean in an optical cavity — put the radiation in a cavity so you have a standing wave, it just sits there, but you can't localize where the photon would be. That's true for anything with a wave nature.
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Classical vs. Quantum Harmonic Oscillator (split)
Right. It's in a region, but you don't have a specific location, just limits on where it might be found.
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Classical vs. Quantum Harmonic Oscillator (split)
The momentum-position version of the HUP tells you that the particle has no definite location.
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Classical vs. Quantum Harmonic Oscillator (split)
There are quantum systems behave like that, so we study it. Such as diatomic molecules. The analysis tells us about their energy states, and that informs us on e.g. how photons might interact with them. We study behavior we can measure of a system in a potential well. Position is not an eigenstate. Energy is. (Do you understand what I mean by eigenstate?)
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Classical vs. Quantum Harmonic Oscillator (split)
It’s small and can safely be ignored on the macroscopic level.
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Classical vs. Quantum Harmonic Oscillator (split)
Nothing literally oscillates. One is solving the problem at the quantum level, and we use the same terminology as the macroscopic problem.
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Classical vs. Quantum Harmonic Oscillator (split)
That’s what a wave function is.
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Classical vs. Quantum Harmonic Oscillator (split)
I recognize the individual words but this makes no sense. A quantum oscillator is one example of a quantum system described by the Schrödinger equation, but not everything described by it is an oscillator. Huh?
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Classical vs. Quantum Harmonic Oscillator (split)
No. The Schrödinger equation for a particle in a box, for example, gives you energy eigenstates. They don’t vary in time, which is why they are called stationary. The particle has no defined motion, and it’s possible to find the particle outside of a well of finite depth. The solution gives probability of where you might find the particle.
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Members in the Mod Queue
LaurieAG has been added owing to recent posts.
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men vs woman
That set of goalposts has already been moved.
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men vs woman
Because of biology, or because of cultural norms and constraints? Here are six current ones. https://www.townandcountrymag.com/society/tradition/g28565280/matriarchal-societies-list/ More, if you go into the history books
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men vs woman
(emphasis added) There are a number of claims here that you have not shown are true, and basing a discussion on false premises leads to a flawed conclusion.
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Comments on Moderation
A recent suspension was announced for "persistently posting above his level of understanding" and I want to clarify that it's not against the rules to be wrong, but it is against the rules to not back up claims. If you're going to assert that the moon is made of cheese, you're going to have to back that up. This requirement is explicitly pointed out in the speculations guidelines. The underlying rules violation is soapboxing: repeated claims without justification for them. Further, making multiple wild assertions not based in any mainstream science can be considered spamming. Both behaviors are unacceptable.
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Only 10% of the Nobel prize winners are atheist ?
There seems to be only one source, with no detail as to how it was collected and what biases might exist.
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Banned/Suspended Users
Angelo has been banned as a sockpuppet (Menan, Polinski)
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Alternative power sources megathread?
Once the air condenses, it releases the energy. If you shift the equilibrium, you are only storing the energy of that amount of water. Plus, you've made the atmosphere more efficient at trapping heat. It's a feedback term. Can you estimate how much energy would be stored for a 1% shift in humidity? I'll bet it's not a lot, comparatively.