How does the physical concept of entropy relates to the information theory concept of entropy? |
- How does the physical concept of entropy relates to the information theory concept of entropy?
- Differences in electric and magnetic dipole transitions?
- How are non-quantized wavelenghts of light produced? i.e. How can a continuum of wavelengths of light exist with seemingly finite possible electron energy levels from which electrons can drop?
- With 95% of the oceans unexplored, is it feasible many prehistoric species still exist ?
- Could gravitational waves explain "dark" energy and/or matter?
- Is it possible to create a black hole using energy instead of mass?
- What property of an atom makes it reflective?
- Why do electrons orbit protons and not just collide with them?
- When can we say normalcy ends and pathology begins?
| How does the physical concept of entropy relates to the information theory concept of entropy? Posted: 14 Jan 2017 11:18 AM PST |
| Differences in electric and magnetic dipole transitions? Posted: 15 Jan 2017 06:37 AM PST To my knowledge, a magnetic moment and dipole moment are simply based on the distribution of charges/currents in the particular case. Thus the 21 cm line in Hydrogen for example is magnetic dipolar because it is caused by spin interactions of the proton and electron. Thus any transitions from the excited state here would be observed to be a magnetic field (although one would still observe an electric field due to Maxwell's equations). Similarly for the 18 cm line in OH (radical), since it is due to an electric dipole (i.e. the extra unpaired electron and the nucleus), the emission from the excited to the ground state would be electric dipolar. But then I also know the 18 cm line has hyperfine transition causes by spin interactions, and so the emitted wave would have both a magnetic and electric component, correct? I was also reading:
and I was wondering why it's more efficient for it to be electric dipolar as opposed to magnetic dipolar? Are not electric and magnetic fields inherently the same, and as long as they have the right frequency, wouldn't an electric field be able to bring an electron to an excited state even if it's a magnetic dipolar transition? I suppose I am beginning to confuse the two types of transitions and how one can experimentally distinguish the two as being inherently different. [link] [comments]  |
| Posted: 14 Jan 2017 09:08 AM PST When electrons drop from one energy level to another, they emit a photon of a specific wavelength. With a finite number of energy levels, it seems the possible number of wavelengths produced would be finite. Not accounting for red-shifting or blue-shifting, how do we get a continuum of possible wavelengths? (I'm not referring to perceived color, here) The idea which led me here is this -- I know that light can pass through glass, because visible light does not have sufficient energy to raise the energy level of electrons enough to be absorbed. When they DO get absorbed, is any excess energy absorbed as heat (explain?), or is some emitted/passed as lower energy wavelengths? All the material I've found so far stops as soon as the photon is absorbed -- without really explaining what happens if a HIGHER energy photon passes through... and what happens when the energy level is high? It seems that if the electrons in glass dropped to a lower energy level, the direction in which the new photon travels would be random. I feel like I'm missing something fundamental which is glossed over because it seems intuitive or obvious... [link] [comments]  |
| With 95% of the oceans unexplored, is it feasible many prehistoric species still exist ? Posted: 14 Jan 2017 10:17 AM PST I don't believe lake monsters or the such, but in vast oceans, could dinosaur-type creatures still roam the seas? Is this where sea serpent tales truly came from? [link] [comments]  |
| Could gravitational waves explain "dark" energy and/or matter? Posted: 15 Jan 2017 01:04 AM PST Gravitational waves can compress space-time while traveling at c and therefore have energy (even though it's a tiny tiny tiny amount of energy). If you take the energy generated by every gravitational wave produced by every system in every galaxy in the universe could it possibly explain all the missing energy and/or mass? [link] [comments]  |
| Is it possible to create a black hole using energy instead of mass? Posted: 14 Jan 2017 09:25 AM PST Instead of compacting mass until it collapses under it's own gravity, is it possible to compact energy (for example, light) until it collapses? [link] [comments]  |
| What property of an atom makes it reflective? Posted: 14 Jan 2017 08:46 AM PST I've been digging around for this answer for a while now, and all I've found is that a smooth surface (on a near atomic levrl) makes ie reflect light, but what is it about the properties of the atom that allow it to reflect light, since light has no mass how does it bounced off the surface etc. Thanks!! [link] [comments]  |
| Why do electrons orbit protons and not just collide with them? Posted: 14 Jan 2017 09:17 AM PST Consider a proton and an electron in empty space separated by some reasonable distance (ie not an atom). They would be attracted and travel towards one another. Now I know that they would eventually come together and form a hydrogen atom. But why? Why don't they just collide one another? I could attempt a hand waves answer talking about s orbitals and the Pauli exclusion principles and allowed energy levels; but I feel like id be skirting around the issue. [link] [comments]  |
| When can we say normalcy ends and pathology begins? Posted: 14 Jan 2017 09:55 AM PST |
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