[QUOTE=areolop;40574679]I think this is the right place to ask this question as it pertains to the theory of relativity. I think it would have an easy answer, but I'm still boggled at it.
Since time is slowed down when near a large object as you know, traveling around a black hole has been hypothesized to mimic time travel because it moves so much slower there than on earth due to its insane mass. This is also true with GPS satellites orbiting earth too - if we didn't correct those daily our navigation could be off by as much as 6 miles.
So this brings me to my question: If you were in empty space without a force of gravity acting on you, would time dilate at an infinitesimally rate? If so, what would it be like coming back to a field of great gravity, with time being dilated less. Would you appeared to have traveled through time (without actually)[/QUOTE]
I'm confused. Do you think time is going to be going slower in empty space, or on the planet? You mention that the dilation would be infinitesimal in space (i.e. essentially zero) but then you say that the dilation is less on the planet.
Regardless, the way it actually works is lower gravitational potential (i.e. closer to earth) means slower clocks. So if a person went into space for a while far from the earth or any other gravitating body, when they returned to the earth they would appear to have aged more quickly than the people on the earth.
Nevermind.
This came up while I was looking up the physics of semiconductors.[URL="http://www.britneyspears.ac"]
www.britneyspears.ac[/URL]
:pwn:
[QUOTE=Mr._N;40590165]This came up while I was looking up the physics of semiconductors.[URL="http://www.britneyspears.ac"]
www.britneyspears.ac[/URL]
:pwn:[/QUOTE]
Looks like something a teacher made to relate the singer and physics to his class
[editline]10th May 2013[/editline]
creepy as shit though
The wavelength of a photon emitted when a hydrogen atom jumps from an excited state to one state lower is the distance light travels in one orbital period of the electron.
Crazy
[QUOTE=JohnnyMo1;40597656]The wavelength of a photon emitted when a hydrogen atom jumps from an excited state to one state lower is the distance light travels in one orbital period of the electron.
Crazy[/QUOTE]
What is the orbital period of an electron? Sorry if it's too annoying of a question.
[QUOTE=JohnnyMo1;40597656]The wavelength of a photon emitted when a hydrogen atom jumps from an excited state to one state lower is the distance light travels in one orbital period of the electron.
Crazy[/QUOTE]
What text are you using/can you show the derivation? That sounds pretty rad
[QUOTE=Disseminate;40601501]What text are you using/can you show the derivation? That sounds pretty rad[/QUOTE]
I'm working from Griffiths. Problem 4.17 c) has "quantize" the earth-sun system to find an analog of the hydrogen atom. It follows from that. (the wavelength of the particle emitted when the earth jumps to a lower "energy level" is one lightyear)
Why is it that vector field theory is so fun yet i managed to fuck up a test in it :c
Quantum final time
HERE GOES A THING
So how did our little man do?
Shit lol. I studied for more than a day straight though (with the odd short break). I got either a high C or a low B, I'm not sure how this one is being curved.
Okay, I didn't do shit, but I didn't do as well as I would like for all the effort I put in. On the other hand, I studied comparatively little for topology and linear algebra and I think I did fine.
[URL]http://forums.spacebattles.com/threads/how-much-damage-would-a.249667/#post-9902074[/URL]
Behold, the most cringe worthy physics related thread in the internet
[quote]It's a Mass Accelerator Cannon which fires a 6 exaton dyson sphere at six hundred billion times the speed of light on a 5 light year long, 1 light year wide and 1 light year tall ship.[/quote]
The OP said the mass of one of the Dyson Spheres was "1,257,969,648,574,348,800,784,640,904,216,896,944,800,248,544 Exatons"
The OP then slowed down the projectile to 6% the speed of light and I think it was calculated to having several orders of magnitude more energy then the universe.
Then they told him that the projectile and the "Mass Accelerator Cannon" would promptly implode and create a big bang event.
[QUOTE=Kyle902;40672770][URL]http://forums.spacebattles.com/threads/how-much-damage-would-a.249667/#post-9902074[/URL]
Behold, the most cringe worthy physics related thread in the internet
The OP said the mass of one of the Dyson Spheres was "1,257,969,648,574,348,800,784,640,904,216,896,944,800,248,544 Exatons"
The OP then slowed down the projectile to 6% the speed of light and I think it was calculated to having several orders of magnitude more energy then the universe.
Then they told him that the projectile and the "Mass Accelerator Cannon" would promptly implode and create a big bang event.[/QUOTE]
He gives an unfathomably large mass and the sphere's diameter (a [I]light year[/I]) and that's it...
Then he asks if it could destroy a solar system. The aphelion distance of Pluto is 0.0008 light years.
:suicide:
Visited CERN (CMS, SPS and some assembly lines) last week. The buildings are fugly (like, the opposite of Google/Apple campuses), but the detectors are awesome. The tunnels and the CMS shaft/cavern are huge and so ridiculously awesome.
This thing
[url]http://cds.cern.ch/record/843400/files/lhc-pho-2001-178.jpg[/url]
ends up here
[url]http://www.energy-daily.com/images/giant-cms-magnet-cern-desk-1024.jpg[/url]
It's the connection between the shaft and the cavern that makes it so awesome (apart from the detector itself, which is something straight out of Akira/The Matrix).
The detector moves on "air cushions" instead of wheels, and it has these huge hydraulic arms at each corner to keep the detector disks upright or something (it's really one big tech/mechanics orgy)
I don't think anything else in the world approaches Black Mesa and the half-life universe better, even the ugly surface buildings seem like they came out of HL2 (airboat chapter, Episode 1, ...). It's kinda amazing how Valve nails big-scale experimental physics in Half-Life years before the LHC was there (though CERN was there since the 60's).
Huge drains, pipes, crimp roof plates, fucking IRIS SCANNERS (with a pressure pad and movement detecting lasers, they said the tiny asians sometimes have trouble getting in because they weigh below 50 kg and fail to activate the pad :v:).
Radiation & laser stickers everywhere (it's just true, physicists are always surrounded by lasers). I didn't even realize the synchrotron radiation makes the inside completely off limits while it's running. Huge concrete shielding, coils, wires, it's too much to name. They just have so much high performance stuff, servers, power supplies, cranes, control rooms that are covered in monitors...
Also Switzerland is expensive as fuck.
It seems so cool to me that you can be working on your PhD in physics and still have to work with your hands e.g. assemble detectors (I love craftsmanship, which it really was). We had an awesome american dude explaining how he worked on multi-wire proportional counters, where he made them with honeycomb pattern plates and gold plated wire (and lots of other stuff).
It's a baffling enterprise and I still don't understand how you could make something that big work when every component requires almost PhD-grade knowledge and has to be tuned to work with all the other (PhD -grade knowledge requiring) components that it links to.
Also protip:
during the next two years, it'll be shut down, which is a good thing tourist-wise because you get to see the underground things, not just the (comparatively) boring surface buildings/structures. So if you want to visit CERN, now's the time.
Proptip 2: you need a wide-angle lens if you want to capture any of the big machines in one photo, because there's not a lot of room.
94% on my last physics formal report that I had to do (basically had to be of publication standards).
Good job, me! Hopefully my next one is just as good.
[QUOTE=Number-41;40702642]Visited CERN....[/QUOTE]
So did you actually get to see the underground tunnels of the CMS?
I was there in February, but was unlucky enough to arrive a few days before they shut it down, so I only got to see a lot of underground control rooms, servers and such.
Well not the tunnels that go around for 27 km because of servicing reasons or something like that. We did see the detector cavern of CMS, which is magnitudes more awesome than the tunnels :P
Talking of CERN and inside the tunnels, I was lucky enough to visit a few years ago and be shown around by a guy who ran the Antimatter Decelerator (went to uni with my teacher). Not nearly as impressive as the LHC, nor is it technically underground but it was still pretty cool to see all the hardware up close. Some pics if anyone is interested:
Tunnel
[img]http://i.imgur.com/pFUGFlf.jpg[/img]
Can't remember what this was, but I think it was to do with cooling.
[img]http://i.imgur.com/Q18aG2i.jpg[/img]
Set of electromagnets.
[img]http://i.imgur.com/CEFC8Fh.jpg[/img]
This wasn't too long after the book/film Angels & Demons and Tom Hanks had been given a tour of the place. As a joke, the AD guys had put up this blackboard.
[img]http://i.imgur.com/cLkPN7a.jpg[/img]
"1 + 1 = 2 QED"
Yes!
Also, saw this on a wall in the PS building:
[IMG]http://i.imgur.com/nRKTJ1n.jpg[/IMG]
Hm, got an acceptable grade from the electricity course.
Only 3 courses/a little under a year left for matriculation examinations :)
[url]http://oyc.yale.edu/physics[/url]
I've been watching these recently. The course assignments, midterm, and final is available as well. Something for a high school student to do over the summer.
Oh shit it's Shankar
his quantum textbook is the bomb
[QUOTE=JohnnyMo1;41033338]Oh shit it's Shankar
his quantum textbook is the bomb[/QUOTE]
He's a pretty funny guy. I like when professor's don't act too dry.
Wow. I didn't realize how simple the derivation of the Klein-Gordon equation was. Take non-relativistic Schrodinger equation, combine with relativistic energy equation, voila.
That moment where you realize that irrotational inviscid incompressible flow is just electrostatics :v:
If it's flowing it doesn't sound very static!
Electricity is clearly a liquid (batteries can LEAK), you know nothing JuhnnyMuu
;_; Benjamin Franklin was right I am disgraced
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