Search found 17 matches

by dkruss
Sun Dec 12, 2004 1:40 pm
Forum: Physics Questions
Topic: The Elegant Universe
Replies: 1
Views: 3811

Re: The Elegant Universe

ps: btw do you guys have a regular weekly talks/meetings? Is Physoc for UNSW students only? I used to study at UNSW but not anymore, but Physoc seems to be a very good place to discuss about Physics I'm really interested in joining. Most of the time we talk about current topics in Physics is betwee...
by dkruss
Wed Dec 08, 2004 4:37 pm
Forum: High School Physics
Topic: I need URGENT help
Replies: 1
Views: 4336

This site lists various alloys used in knives http://www.benchmade.com/about_knives/our_blades.asp . You could Google search each alloy (eg type in "431 stainless steel" and you will get a list of sites with details of the allows) and compare the differences to stainless alloys such as 308...
by dkruss
Mon Nov 22, 2004 8:53 pm
Forum: High School Physics
Topic: URGENT!! need help in phy. coursework--IRON!!!
Replies: 1
Views: 4251

I haven't covered this stuff for a couple of years so I can't give answers, but I can give some clues where to look. The first question,, have a look through books on ferromagnetism. Also some chemistry books could be useful as the electron configuration of iron also contributes to magnetic properti...
by dkruss
Tue Jul 27, 2004 7:52 pm
Forum: High School Physics
Topic: Torsion Fields
Replies: 2
Views: 4823

The torsion field is a controversial concept in general relativity (a bit like cold fusion). Was it mentioned at school or did you read about it in private study? I did a google search and these sites keep the maths to a minimum, but may not be creditable. A lot of the research is from Russia, thus ...
by dkruss
Sun Jul 25, 2004 11:12 pm
Forum: High School Physics
Topic: From quarta to quark
Replies: 2
Views: 4863

Again rather than give a direct answer I prefer to give you some useful facts to research on. Controlled Nuclear Reactions. A little reactor theory. A nuclear reactor has several critical components. The fuel rod (either enriched uranium or plutonium) which contains fissionable atoms, control rods t...
by dkruss
Tue Jun 01, 2004 5:55 pm
Forum: High School Physics
Topic: isotopes
Replies: 1
Views: 3765

Iridium 192, h/l 73days
Cesium 137 h/l 33yrs
Cobalt 60 h/l 5.3yrs


Do web searches on radiographic testing, weld testing using gamma rays, etc. Maybe do a search on Ansto's website as they have a large engineering division, www.ansto.gov.au
by dkruss
Sat May 29, 2004 8:33 pm
Forum: High School Physics
Topic: about the quantum to quark
Replies: 1
Views: 3929

Principal quantum number "n" is an integer number which is used to label energy levels of electron shells in atoms (They are also used for energy levels of a nucleus and any other quantum system). The Bohr model is a good example as to how they are used. Secondly we have orbital angular mo...
by dkruss
Tue May 25, 2004 10:22 pm
Forum: Physics Questions
Topic: Does light have gravity
Replies: 16
Views: 15006

Are you a physics student, if so come to Physoc room.
by dkruss
Tue May 25, 2004 10:10 pm
Forum: Physics Questions
Topic: Does light have gravity
Replies: 16
Views: 15006

These discussions can get quite in depth and need general relativity to explain the problem. Put simply, the photon is not bent by gravity, but gravity is bending the path in which the photon travels - a result obtained in general relativity. As for numbers of photons vs gravity force I can't give a...
by dkruss
Tue May 25, 2004 9:14 pm
Forum: High School Physics
Topic: photocells and solar cells
Replies: 6
Views: 24797

The photoelectric effect is a different process to that of a solar/photo cell. For the photoelectric effect, have a look at Prof Wolfe's notes here http://www.phys.unsw.edu.au/~jw/1231/quantum.pdf Things a different in solar/photo cells. In a photocell we ususally have a semiconductor junction that ...
by dkruss
Mon May 24, 2004 11:24 pm
Forum: Physics Questions
Topic: Hello from the Physics Students Society
Replies: 0
Views: 12630

Hello from the Physics Students Society

Just a reminder that first year students are welcome to come to the Physoc room which is just around from the first year teaching office infront of the toilets in room 4. We have not seen many first years around this year and we would like to make you feel welcome. If you come in, introduce yourself...
by dkruss
Mon May 24, 2004 10:54 pm
Forum: High School Physics
Topic: question about limitations of the bohr atomic model
Replies: 2
Views: 4651

Taking a classical approach, the power of radiation emitted is proportional to the Bohr raduis^4/orbit radius^4 and if you do some more maths you can show that the electron will fall into the nucleus in 10^-8 seconds. But we live in a quantum mechanical world and we need to consider the problem usin...
by dkruss
Mon May 24, 2004 10:15 pm
Forum: High School Physics
Topic: photocells and solar cells
Replies: 6
Views: 24797

They are fundamently the same thing. Solarcells are called solarcells because they are designed to collect solar energy. Photocells are small devices that are used for purposes other than collecting solar energy where the intensity of light is needed to be measured. An example of a use of a photocel...
by dkruss
Fri Apr 30, 2004 9:28 pm
Forum: High School Physics
Topic: superconductors
Replies: 2
Views: 4453

The property that causes magnetic field to be expelled is called the Meissner effect. I think this like is helpful, http://hyperphysics.phy-astr.gsu.edu/hbase/solids/maglev.html Also, http://hyperphysics.phy-astr.gsu.edu/hbase/solids/meis.html For the supercurrents to be created (induced) there need...
by dkruss
Tue Mar 16, 2004 7:46 pm
Forum: Physics Questions
Topic: Email Q3: Light & Uncertainty
Replies: 2
Views: 4797

The uncertainty principle does apply to light waves as light waves are photons. There is a bit of discussion on the principle here http://www.phys.unsw.edu.au/bbs/viewtopic.php?t=220 In response to part 1 of your question. Shining light (photon beam) from either side of the particle would not cancel...