If photons have a minimum wavelength, what happens when photons at that energy are blue shifted? |
- If photons have a minimum wavelength, what happens when photons at that energy are blue shifted?
- Does the amount of dark, paved surfaces humans have made have a measurable impact on local temperatures or global climate change?
- Why do we use xenon and not for example helium in ion propulsion engines?
- Would a being living in a hyperbolic space be able to tell that its space was a hyperbolic shape?
- What are the best theories (if any) we have for what dark matter and dark energy is?
- Is it possible for a spacecraft to re-enter the atmosphere without needing a heat shield?
- So exactly what IS energy?
- Is there a "safer" alternative to Uranium235 for nuclear power generation?
- Can ovaries regrow, whether completely or in part, after an overiectomy?
- What is the slingshot effect and how does it work?
- Water boils at about 7 degrees in .01 atmospheres. Could you cook instant ramen in this boiling water?
- Does using two WiFi routers increase the variance in signal strength?
- Why do certain tv channels come in when I'm close to the antenna?
- What exactly is vacuum energy and what effects can it have?
- Why is it that certain metals, glasses and plastics can be wipe or polished clean?
- Is it theoretically possible to CREATE a new planet??
- Is there a simple sequence of moves on a Rubik's cube that will cycle through every possible arrangement?
- Now that SHA-1 has been broken, what would it take for crackers to break SHA-256 or SHA-512? Is it just a matter of processor time?
- Can glass be boiled?
- How do electrons jump the gap in a capacitor without the emf of a battery present?
- Space and time are just 2 facets of the same thing (spacetime), and this ST has been expanding in all directions since the Big Bang. I can understand what that would mean spacially (galaxies moving apart from each other), but what would that mean temporally?
| If photons have a minimum wavelength, what happens when photons at that energy are blue shifted? Posted: 04 Mar 2017 01:00 AM PST My understanding is photons can't have a wavelength smaller than the Planck length (though I'm not completely clear on why)- So what happens if you shine light at, say, twice that wavelength at someone moving towards you at 0.9c? it seems like, in the reference frame of the person moving towards you, the wavelength would be different by a factor of 1/(1- v2/c2) so it would go from 3.2*10-35 m to 6.1*10-36 m. That would mean it was below the minimum wavelength though, so what would actually happen? [link] [comments]  |
| Posted: 03 Mar 2017 07:17 AM PST For instance will cities with lots of paved roads and parking lots be hotter because of that? And if this effect exists, is there enough paving on earth for it to contribute to the global climate? [link] [comments]  |
| Why do we use xenon and not for example helium in ion propulsion engines? Posted: 04 Mar 2017 02:10 AM PST |
| Would a being living in a hyperbolic space be able to tell that its space was a hyperbolic shape? Posted: 04 Mar 2017 06:28 AM PST Also, if our hyperbolic being was a 18th century timid mathematician, would he be able to conceptualize euclidean geometry and see it as complex as hyperbolic is to us? [link] [comments]  |
| What are the best theories (if any) we have for what dark matter and dark energy is? Posted: 03 Mar 2017 05:33 PM PST |
| Is it possible for a spacecraft to re-enter the atmosphere without needing a heat shield? Posted: 04 Mar 2017 04:19 AM PST Can a spacecraft not just use its airodynamics to bleed its speed in the upper atmosphere without moving to an altitude where the atmosphere is dense enough to create high temperatures? [link] [comments]  |
| Posted: 03 Mar 2017 05:18 PM PST |
| Is there a "safer" alternative to Uranium235 for nuclear power generation? Posted: 03 Mar 2017 11:40 PM PST I understand that U235 decays into a number of elements that are themselves radioactive (i.e. radioactive waste). I am wondering if there is an isotope of any element that decays into stable isotopes only (and therefore produces no radioactive waste) that we could use in reactors or if there is a way to influence/control the outcome of U235 decay to make the waste products less radioactive. Any ideas? [link] [comments]  |
| Can ovaries regrow, whether completely or in part, after an overiectomy? Posted: 03 Mar 2017 06:36 PM PST We're in a bit of a conundrum, [and are waiting for formal medical advice - appointment with the GP is next week - this is not a request for medical advice, just some basic knowledge]. A close friend had a bilateral ovariectomy and hysterectomy about 20 years ago. She is being investigated for abdominal pain, possibly a kidney stone, but the radiologist came back with this baffling statement that he can see both ovaries on her pelvian echography. Apparently one of them even has a cyst. We're completely puzzled! She went to the archives and exhumed her surgery report from 20 years ago to be sure her memory wasn't at fault; it explicitly states that both ovaries were completely removed. How is this possible? Can ovaries grow back? Are there alternative interpretations? Can it be some other type of tissue? [link] [comments]  |
| What is the slingshot effect and how does it work? Posted: 03 Mar 2017 07:19 PM PST |
| Posted: 03 Mar 2017 11:27 PM PST |
| Does using two WiFi routers increase the variance in signal strength? Posted: 03 Mar 2017 02:37 PM PST When using two WiFi routers on the same network, you'd expect to see some destructive interference—necessarily more so than you'd see in a single-router network. I infer this from fooling around with two sources of the same frequency in a ripple tank. Is this a correct conclusion to draw? We all experience issues with dead zones in single-router setups; does using two routers exacerbate this problem? How sensitive is this to particular conditions? Are there two-router systems that are 'smart' and send different signals depending on what connections they have? [link] [comments]  |
| Why do certain tv channels come in when I'm close to the antenna? Posted: 03 Mar 2017 06:43 PM PST I have a $20 Wal-Mart digital TV antenna. Why does my ABC station only come in when I am sitting at my computer, 3 ft from my antenna on a bookshelf, but not when I'm elsewhere in the room? I've looked up the antenna strengths and they only broadcast at 1/4 of the other big stations. But still, why does me moving 2-3 feet affect the signal so much to come in almost perfectly when I'm in the right spot? [link] [comments]  |
| What exactly is vacuum energy and what effects can it have? Posted: 03 Mar 2017 02:02 PM PST I've been trying to do my own research on this, but most of what I've found is a lot of quantum physics jargon that I really don't understand. Any help would be great. [link] [comments]  |
| Why is it that certain metals, glasses and plastics can be wipe or polished clean? Posted: 03 Mar 2017 08:40 AM PST In the past, I sold a metal polishing/cleaning product called Flitz that would clean most metals all the way to the base layer. I also have glassware that needs constant cleaning that no matter how dirty it gets, I can always get it to a sparkling shine! This made me wonder how no matter how much tarnish some things can get, they can be restored to a near new look. Now, I believe it could have something to do with these materials having pores and it's a matter of flushing particles out. I've also heard somewhere that metals, glass, and plastics lose a thin layer everytime they're scrubbed or polished. I'm not exactly sure how to research this so I hope you guys have informed answers! :D Thank you in advance for your thoughtful answers! [link] [comments]  |
| Is it theoretically possible to CREATE a new planet?? Posted: 03 Mar 2017 05:14 PM PST We hear about "habitable" planets being discovered everyday.But in the future with enough technology can a planet be created to sustain human life ?OR can a planets atmosphere be altered with some technology ? I just want to know.It maybe silly/stupid.Like theoretically is it possible.?? [link] [comments]  |
| Posted: 03 Mar 2017 03:37 AM PST That is, would there be a sequence of moves which if repeated for long enough would ALWAYS solve the cube eventually? [link] [comments]  |
| Posted: 03 Mar 2017 05:47 AM PST It's been broken: http://www.shattered.io/ They recommend moving on to SHA-256 or SHA-512:
But if the algorithm is basically the same and only the block size changes, why is it safer? Is it only because the required processor time would be exponentially larger? [link] [comments]  |
| Posted: 03 Mar 2017 07:51 AM PST Can materials like glass be boiled and evaporated like water? I've been trying to find a simple answer to this all morning, but the most I've been able to find is that glass at a high enough temperature appears to boil, but really it's just air bubbles that are simply rising to the surface. [link] [comments]  |
| How do electrons jump the gap in a capacitor without the emf of a battery present? Posted: 03 Mar 2017 09:32 AM PST In school we have been using a voltmeter to measure the discharge rate of a capacitor but I don't know why the electrons continue to jump the capacitor gap and discharge without a emf. Also how if you charge a capacitor is one plate negative and the other positive, surely the other would be neutral? [link] [comments]  |
| Posted: 03 Mar 2017 04:58 AM PST |
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