Search found 28 matches

by Teppic
Sun Oct 19, 2008 2:25 pm UTC
Forum: Science
Topic: Understanding Strings
Replies: 12
Views: 1517

Re: Understanding Strings

In quantum mechanics and anything on that scale you are entitled to regard mathematical constructs as real and vice versa. No. You misunderstand the metaphysics of observables. Which is of course the problem. If a theory is self consistent and produces observables it is deemed "true". Thi...
by Teppic
Tue Oct 14, 2008 6:58 pm UTC
Forum: Science
Topic: fancy atoms and their use
Replies: 3
Views: 1049

Re: fancy atoms and their use

Given how much energy it takes to create just a few particles of this type, we're not going to see buildings, let alone small samples (1g) anytime soon. And the reason why they are high energy is because its very uncommon to see them unbound. I dare say its rationally possible, just balancing radiu...
by Teppic
Tue Oct 14, 2008 5:54 am UTC
Forum: Science
Topic: Is my 'Science' welcome here?
Replies: 57
Views: 6206

Re: Is my 'Science' welcome here?

As done to death by Adam Curtis; Social sciences fail because they only provide solutions where the subjects are considered to be rational agents. Particles are rational agents (or we can fiddle the math to make it so). Chemicals are rational agents. People arent. Also the problem of prediction. The...
by Teppic
Tue Oct 14, 2008 5:50 am UTC
Forum: Science
Topic: Favorite phenomenon
Replies: 23
Views: 2459

Re: Favorite phenomenon

Hawking radiation, and the evaporation of black holes, is just awesome. Well if we're going to be making things up I want Teppic Radiation. It appears on the head of a thorium pin and cant be detected because I say it has an antiparticle. Teppic Radiation only exists because, obviously, thorium pin...
by Teppic
Tue Oct 14, 2008 5:48 am UTC
Forum: Science
Topic: Favorite phenomenon
Replies: 23
Views: 2459

Re: Favorite phenomenon

F-centres.
by Teppic
Tue Oct 14, 2008 5:41 am UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 722384

Re: Common Questions

What do scientists call energy that doesn't cost money? Like energy that you get at work when you plug your phone in to charge it, or energy you get from putting your things in ths sun to dry them, or wehn someone gives you a can or petrol for your birthday. I was confused by the OP for a moment an...
by Teppic
Tue Oct 14, 2008 5:39 am UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 722384

Re: Common Questions

Regarding the uncertainty principle: If I measure the position( and I don't know its momentum) of something with light of wavelength X, does that mean that my uncertainty in it's position is literally +/- the wavelength? Or is that a simplification of the uncertainty principle? Thats not really the...
by Teppic
Tue Oct 14, 2008 5:27 am UTC
Forum: Science
Topic: I created a perpetual motion machine!
Replies: 58
Views: 9154

Re: I created a perpetual motion machine!

Willis888: The technical term is almost sure . ... Any finite number of flips would have those probabilities as close-to-but-not-exactly 0 and 1, but infinity often makes things more complicated. Thank you. This pertains to a theory I have posted in the "Childhood Crackpot Theories" threa...
by Teppic
Tue Oct 14, 2008 5:17 am UTC
Forum: Science
Topic: Electricity from beta decay?
Replies: 24
Views: 7318

Re: Electricity from beta decay?

Charlie! wrote:Well, it also causes the creation of a proton, so I'm going to guess that any flow of charge is minimal.


Actually in a lab environment beta sources have to be earthed. Indeed I remember a field equation question about the charge build up on a beta source.
by Teppic
Tue Oct 14, 2008 5:16 am UTC
Forum: Science
Topic: Electricity from beta decay?
Replies: 24
Views: 7318

Re: Electricity from beta decay?

I didn't find a thread on this when I searched, so I don't think it's been done before. I thought of something a while back and I'm wondering if it could work. When an element goes through beta decay, it produces a stream of electrons, right? Would it be possible for this kind of element to be used...
by Teppic
Fri Sep 19, 2008 4:13 pm UTC
Forum: Coding
Topic: Good beginner projects in C?
Replies: 34
Views: 5408

Re: Good beginner projects in C?

Here's a quick one, shouldn't take you two long. Implement Euclid's Algorithm to find the greatest common divisor of two user defined integers. A little bit longer: write two functions to calculate Fibonacci numbers. First, a recursive function using F_n = F_{n-1} + F_{n-2} , then the second one us...
by Teppic
Thu Sep 18, 2008 7:40 pm UTC
Forum: Coding
Topic: Good beginner projects in C?
Replies: 34
Views: 5408

Re: Good beginner projects in C?

Whats a pointer? Id assume, through sheer common sense, %x is because it points to a variable?
by Teppic
Thu Sep 18, 2008 5:41 pm UTC
Forum: Coding
Topic: Good beginner projects in C?
Replies: 34
Views: 5408

Re: Good beginner projects in C?

Can someone explain "%d" and "%f". Is it the value of the variable, or the location of the variable? It's the value of the corresponding variable (or string literal or number depending on the letter after the %). printf("%d", 5); would print 5. float foo = 5.12; printf...
by Teppic
Thu Sep 18, 2008 2:25 am UTC
Forum: Coding
Topic: Good beginner projects in C?
Replies: 34
Views: 5408

Re: Good beginner projects in C?

Well for starters I fixed this guys sine table computation;
http://www.physics.drexel.edu/students/ ... ics/#first
How sloppy.
Can someone explain "%d" and "%f". Is it the value of the variable, or the location of the variable?
by Teppic
Thu Sep 18, 2008 12:35 am UTC
Forum: Coding
Topic: Good beginner projects in C?
Replies: 34
Views: 5408

Good beginner projects in C?

I tried following cprogramming.com but its not really my kind of learning process. And any of the examples are very specific, to begin with. When I learnt BASIC I went through making menu's and mathmatical computation, but since in C all that needs is "#include <math.h>" I dont really know...
by Teppic
Wed Sep 03, 2008 2:45 am UTC
Forum: Science
Topic: What does the Atom look like?
Replies: 32
Views: 7267

Re: What does the Atom look like?

Yep, they go from A to C without passing through B. As for the transition being instantaneous - I can't honestly say. (EDIT: I wonder about this actually. No one's ever told me it's not instantaneous but it seems like a violation of relativity if it were. I'm sure I'll find out next year.) I imagin...
by Teppic
Wed Sep 03, 2008 2:09 am UTC
Forum: Science
Topic: Radioactive Isotopes and UK Law
Replies: 3
Views: 884

Radioactive Isotopes and UK Law

I wish to purchase a gamma ray source, something like Europium152 with a small activity (microcuries). Now I know these are exempt under your NRC regulations but what of european/UK law?
by Teppic
Wed Sep 03, 2008 2:06 am UTC
Forum: Science
Topic: Heisenberg Uncertainty Puzzle
Replies: 21
Views: 2359

Re: Heisenberg Uncertainty Puzzle

Well ignoring everything else you have indistinguishable particles. In a box. Whatever you do the uncertianty principle is unaffected since even if you quantified the commutator, then it would be much bigger than the reduced planck constact
by Teppic
Tue Sep 02, 2008 9:14 pm UTC
Forum: Science
Topic: Homemade spectrometer
Replies: 2
Views: 2427

Re: Homemade spectrometer

It should just catch the first order of the visable spectrum, which I guess is about 23 degrees. 2nd order, even if it could be made visible, would be 54 degrees. Obviously Id have to order the ccd/digicam and see how big the aperture is. Maybe it would stand using a turret. Ill have to test how fin...
by Teppic
Tue Sep 02, 2008 3:51 am UTC
Forum: Science
Topic: Homemade spectrometer
Replies: 2
Views: 2427

Homemade spectrometer

Just for fun I thought Id try and make my own optical spectrometer. Based on the monochromator I used for my undergrad dissertation I came up with the following design. Apologies for the crappy photoshop graphics, I dont have autocad on this computer; http://img247.imageshack.us/img247/3793/specplan...
by Teppic
Tue Jun 17, 2008 12:21 am UTC
Forum: Mathematics
Topic: Favorite math jokes
Replies: 1452
Views: 489597

Re: Favorite math jokes

It has no punch line, and is completely wrong. Even if you meant in the pantheist force of nature as manifest as many scientists do when they talk about the divine, you are wrong to do so. Because it makes the maths bit opposed to it, and hypocritical to compare the two in what was, Im sure, meant t...
by Teppic
Sun Jun 15, 2008 10:52 pm UTC
Forum: Mathematics
Topic: Favorite math jokes
Replies: 1452
Views: 489597

Re: Favorite math jokes

An old joke, surprised it hasnt been posted; During the soviet block era, a polish scientist, a mathematician, and his brother want to escape to the west. They fall on a plan to hijack a aeroplane. They rush the airport guards get on the flight deck and barracked themselves in. Suddenly they realise...
by Teppic
Fri Jun 13, 2008 1:04 am UTC
Forum: Mathematics
Topic: Prime composites
Replies: 12
Views: 1220

Re: Prime composites

I think you missed the point Anton. And if we ignore the obvious one, depending on your viewpoint of obvious, then you still dont get it, Im not saying that the combination of any two primes with produce a sum with divisors which will make primes. Just some. And how they occur. or why they occur. No...
by Teppic
Fri Jun 13, 2008 12:07 am UTC
Forum: Mathematics
Topic: Prime composites
Replies: 12
Views: 1220

Re: Prime composites

I dont mean "recreational maths" like Hardy would describe it. But yeah, I would agree, coming from a phys grad background very few recreational physics books are ever about physics. More philosophy. Which was my minor/dual depending on your side of the pond. But what can you do? Id love t...
by Teppic
Thu Jun 12, 2008 11:51 pm UTC
Forum: Mathematics
Topic: Prime composites
Replies: 12
Views: 1220

Re: Prime composites

7+11=18=2*9
2+9=11 9-2=7

But yeah I wasnt expecting to get much out of it. Just wondered if there was something I was missing. I do alot of recreational math reading, mostly around number theory. So I would be surprised if it wasnt noticed. Its not the kind of thing you can word in google.
by Teppic
Thu Jun 12, 2008 11:22 pm UTC
Forum: Science
Topic: Favorite Scientist?
Replies: 84
Views: 9356

Re: Favorite Scientist?

Has to be Feynman. I knew nothing about him until a class on Maxwell's differential equations and the tutor mentioned something about the meaning of a negative vector. It kinds of irks me that people, maybe not in america but certianly here, here have wet dreams over Hawking, who it has to be said d...
by Teppic
Thu Jun 12, 2008 11:16 pm UTC
Forum: Science
Topic: Favorite home experiments
Replies: 590
Views: 482620

Re: Favorite home experiments

If you can find a cheap usb monochromating spectrometer (100 pounds on ebay) you can study colour centres in salt. Since you can get accurate predictions from particle in a well wave equations its fun to show your kids the weird world of quantum. Which the british school system will not. Alright its...
by Teppic
Thu Jun 12, 2008 11:11 pm UTC
Forum: Mathematics
Topic: Prime composites
Replies: 12
Views: 1220

Prime composites

One too many nights reading the penguin book of curious and interesting numbers has got to me. I got thinking about prime addition in bed and got stuck. I doubt this is very interesting or unique or undiscovered but Im only a physics undergrad, grad in a about 24 hours, so I thought why not ask on m...

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