In a double slit experiment, is there a minimum necessary distance between the photon (or other particle) source and the slits in order to see interference? |
- In a double slit experiment, is there a minimum necessary distance between the photon (or other particle) source and the slits in order to see interference?
- Would trees grow taller in reduced gravity?
- How scientifically legitimate is commercial DNA testing to identify ethnicity? 'biology'
- Would shooting a grenade actually cause it to detonate?
- Was CMBR visible light in earlier periods of the universe?
- How does photooxidization work during the process of glass solarization?
- Is it possible to halt a light beam with light?
- How do we know that massless particles really are massless, and don't just have masses far too small for us to detect?
- Is there a limit to how big a plane can get and still be able to fly?
- What are some interesting finite numerical sequences?
- Why do we use Vega as the 0.0 for Apparent Magnitude of stars?
- Can a photon only interfere with itself?
- Do different wavelengths of electromagnetic radiation have different stabilities?
- Why does biting something help deal with pain?
- Best material/stuff to look at with a 400x microscope?
- What would be the effect of removing mosquitoes from the ecosystem?
- Can silicon make the same sort of variety of compounds as carbon?
- What specific type of continuum is the concept of Space-Time?
- Where do photons "appear" from when an electron loses energy?
- I know we can move through time faster, but is there any way we could move through time slower?
| Posted: 20 May 2016 07:57 AM PDT If we put the laser/source right up against one of the slits, surely we wouldn't get two slit interference, no? If there is a minimum distance here, does it depend on the type of particle? Also what happens if we reflect the photons off a mirror on their way to the slits? In this case, is the relevant distance the total distance or only the distance from the mirror to the slits? Edit: after some googling, I think I'm asking about the wave packet dispersion relation, discussed here, especially Dominique's final equation. I want to know a) if interference requires sufficient dispersion for the wave to cover both slits and b) if the wave hitting a mirror (pre-slits) is a measurement-style interaction that causes its Gaussian to become fairly narrow/well localized again, which might prevent the wave from covering both slits. [link] [comments]  |
| Would trees grow taller in reduced gravity? Posted: 20 May 2016 02:59 PM PDT I've seen forests where one tree can outgrow all those around it and stays on top. This suggests to me that the smaller trees have hit a maximum height that they don't grow past, despite a different species of tree that is able to grow taller under the same conditions. Is there physical or biological limits that halt a tree's growth once it reaches a certain height? And if you get rid of gravity, could that tree grow indefinitely tall? [link] [comments]  |
| How scientifically legitimate is commercial DNA testing to identify ethnicity? 'biology' Posted: 20 May 2016 03:16 PM PDT There have been many different sites over the past few years claiming that they can do anything from determining if you are related to this or that famous person (which to me personally seems absurdly improbable) to determining your ancestry more broadly in terms of ethnicity and a general background. I'd like to hear from a few geneticists, biologists or any related field on how credible sites like 23andme are and their accuracy when it comes to identifying your ancestors' background, their ethnicity and possibly even their nationality. Thank you in advance. [link] [comments]  |
| Would shooting a grenade actually cause it to detonate? Posted: 20 May 2016 03:07 PM PDT Sorry in advance if this is the wrong sub, but it's something you always see in movies or video games, but how accurate is that? I know some explosives, like C4, will only detonate if the right detonator is used, is the same true for grenades? [link] [comments]  |
| Was CMBR visible light in earlier periods of the universe? Posted: 20 May 2016 03:37 PM PDT If Cosmic microwave background radiation was once gamma but red-shifted to microwave, does this mean that at some point the photons we are receiving would have been within the visible spectrum of light in earlier period in the universe? If so when? [link] [comments]  |
| How does photooxidization work during the process of glass solarization? Posted: 20 May 2016 08:51 PM PDT Im trying to understand how ultraviolet light induced oxidization can cause electrons to...stop? If gaps in the color centers are being filled with electrons, how is the color change based on the added electrons interaction with the light spectrum? Does the number of electrons in the gap influence the spectrum shift? Is there any cheap way to test what acquired crystallographic defects have in the nonvisible light spectrum? [link] [comments]  |
| Is it possible to halt a light beam with light? Posted: 20 May 2016 09:36 PM PDT I was reading about destructive interference, and I suspect that this might give some insight to my question, but I don't know if it totally answers it. Basically if there are two lasers perpendicular to one another, could one beam act as a wall so that the other does not shine beyond it? If it is possible to do is it dependent on the actual wavelength of the light, or is it relative (as in a blue laser would block a red laser but not a green one)? Thanks in advance! [link] [comments]  |
| Posted: 20 May 2016 12:56 PM PDT |
| Is there a limit to how big a plane can get and still be able to fly? Posted: 20 May 2016 03:35 PM PDT |
| What are some interesting finite numerical sequences? Posted: 20 May 2016 11:33 AM PDT Most "general interest" mathematical sequences we hear about are infinite. What are some finite mathematical sequences which are of general interest? [link] [comments]  |
| Why do we use Vega as the 0.0 for Apparent Magnitude of stars? Posted: 20 May 2016 01:24 PM PDT |
| Can a photon only interfere with itself? Posted: 21 May 2016 04:23 AM PDT In the double slit experiment, if we turn down the intensity of the light such that only one photon is emitted at a time, there is still an interference pattern indicating the photon interfered with itself to produce the interference pattern. Therefore, is it true that photons can only interfere with themselves? The reason I ask is that relativity says simultaneity is in the eye of the observer. So, if we have photons A and B, one observer might "see" them enter the slits at the same time while another would say one preceded the other and couldn't have interfered. Therefore, would the only way for interference to happen is with a single photon always interfering with itself? [link] [comments]  |
| Do different wavelengths of electromagnetic radiation have different stabilities? Posted: 20 May 2016 12:12 PM PDT We all know that matter can be unstable or stable, hence things like high reactivity and decay. Would different types of waves such as a high energy gamma ray be more prone to decomposition compared to say visible light? [link] [comments]  |
| Why does biting something help deal with pain? Posted: 20 May 2016 01:58 PM PDT Like the phrase "bite the bullet", you would be given something to bite down on during certain procedures. Why does biting down on something help? [link] [comments]  |
| Best material/stuff to look at with a 400x microscope? Posted: 20 May 2016 10:25 AM PDT I am a science teacher looking for cool stuff to look at with my school microscopes. Highest magnification is 400x [link] [comments]  |
| What would be the effect of removing mosquitoes from the ecosystem? Posted: 20 May 2016 08:35 AM PDT CDC said that there have been >100 instances of Zika in the U.S. so far, which reminded me that there is a company, Oxitec, which has been marketing genetically modified mosquitoes that would eliminate mosquito populations through breeding in areas prone to mosquito-borne illnesses. Is anybody familiar with the outcomes/results of these efforts to date in the places where they have been tested? Have mosquito populations been eliminated? Have relevant infection rates decreased? Has there been other observable damage to the surrounding ecosystem? More broadly, how important are mosquitoes to their ecosystems? Does it vary significantly from place to place such that this is an impossible-to-answer question, or are there things we can say generally about the expected effects of using Oxitec's mosquitoes (or some other form of broad mosquito elimination) on surrounding ecosystems? [link] [comments]  |
| Can silicon make the same sort of variety of compounds as carbon? Posted: 20 May 2016 04:31 PM PDT Since carbon and silicon are both in the same group, can silicon make the same variety of compounds as carbon? If it can, what properties do those compounds have in comparison to organic compounds? [link] [comments]  |
| What specific type of continuum is the concept of Space-Time? Posted: 20 May 2016 07:16 AM PDT I know I'm out of my depth, but what label would be correct? For example, is it a homogeneous decomposable continuum? [link] [comments]  |
| Where do photons "appear" from when an electron loses energy? Posted: 20 May 2016 11:36 AM PDT I'm learning about this currently, and I wasn't able to get a good answer as to where the photon comes from? My understanding is when the electron loses energy, it jumps down am orbit and the energy is released as a photon. Is the photon released from within the electron? My knowledge is more than likely a very simplified way of how it works, and I was hoping it could be expanded on. Thanks:) [link] [comments]  |
| I know we can move through time faster, but is there any way we could move through time slower? Posted: 20 May 2016 07:46 AM PDT I was thinking about time travel. If I get in a space ship and swing around a black hole or move at the speed of light, and I return to my original position in space say a year later (for me), I traveled through time at a different rate than everyone else and everyone I know and love will be much older or long gone depending on how fast I traveled. Is there any way to do the opposite? Imagine if you will... scientists create some sort of huge self-sustaining bio-dome with it's own atmosphere and the technology and fuel to sustain it for say 100,000 years. Would there be any way to send it somewhere and in a year when it returns (if it returns), 100,000 years would have passed for life in the bio-dome, and we could see the results of 100,000 years of evolution? Trying to think of a scenario of how this could happen. The universe is expanding. Are some parts of the universe expanding faster than other parts? Would it be possible to say use a worm hole (assuming we could create and control one) to place an object in another part of space that was going faster through time than we are? Then (again with the worm hole), get it a year later? Any other possibilities? [link] [comments]  |
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