« first day (2678 days earlier)      last day (61 days later) » 

HNQ
2:47 AM
2
Q: The electric charge of quarks

naia_fHow can we determine the electric charges of quarks? And what are the values? The color charge is not the electric charge... How do we even know their electric charge? I would think that there are more ways how the quarks' charge could be distributed.

 
 
3 hours later…
HNQ
6:08 AM
1
Q: Why correlation functions are only defined as time-ordered ones?

GoldI have one slight confusion with something that Blumenhagen & Plauschinn state in the book "Introduction to Conformal Field Theory: With Applications to String Theory". In page 24 regarding radial ordering they state: Note that there is some ambiguity in Eq. (2.35) because we have to decide whet...

 
 
4 hours later…
HNQ
9:55 AM
1
Q: Why does water contracts on melting whereas gold, lead,etc expands on Melting?

Akhil Kumar SinghMy book mentions that water contracts on melting, but the book doesn't give any reason why it does so. It is mentioned that: $1\,\mathrm g$ of ice of volume $1.091\,\mathrm{cm}^3$ at $0^\circ\mathrm C$ contracts on melting to become $1\,\mathrm g$ of water of volume $1\,\mathrm{cm}^3$ at $0^\cir...

 
HNQ
10:20 AM
2
Q: What is meant by "non-relativistic"?

Brian BlumbergI am reading a document on cosmology and particle physics (this s the first time I look into something like this). It frequently states the word "non-relativistic" but I do not understand what is meant by this. When I try to Google it, I don't get a straight answer. The passage I'm referring to i...

 
 
3 hours later…
HNQ
12:52 PM
2
Q: Color of a flame

PhysicsWizardUdI use an LPG (liquefied petroleum gas) gas stove at home for cooking purposes. I notice that, in the flame, the bottom part is almost always blue but the top has a yellowish-orange color. Why is that? Edit - There was a suggestion from the community asking me whether an answer regarding the color...

 
HNQ
1:43 PM
2
Q: Can interference take place if the medium between the slits and screen is changed?

JoeIn Young's double-slit experiment, the medium between the slits and screen is usually air. But, if we replaced air with another medium, for example water, the wavelength of light would change and the fringe separation should also change as it is equal to wavelength times distance from slits to sc...

 
 
10 hours later…
HNQ
11:51 PM
4
Q: How "real" are the worlds of the many-worlds interpretation?

mYnDstrEAmAre there different interpretation variants of the MWI with varying conceptions of how real these worlds are? How "real" are those many worlds according to the interpretation/s? Is it better thought of as different physical universes or one universe with different history contents with those hist...

 

« first day (2678 days earlier)      last day (61 days later) »