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Last Post By: albertwilson ON: Fri Jul 30, 2010 5:39 am
Topic By: albertwilson ON: Fri Jul 30, 2010 5:39 am
"In general relativity, gravitational waves propagate at the speed of light, and so gravitons are massless. The massless- ness can be traced to symmetry under diffeomorphisms in your math background".

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Last Post By: albertwilson ON: Fri Jul 30, 2010 5:36 am
Topic By: albertwilson ON: Fri Jul 30, 2010 5:36 am
I've read a piece on his theory and I'm having a little difficulty understanding it. I've used the famous E = MC^2 in calculations before but I want to have more understanding of the theory behind it.

Any info would be great.

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Last Post By: albertwilson ON: Fri Jul 30, 2010 5:34 am
Topic By: albertwilson ON: Fri Jul 30, 2010 5:34 am
They have i am reading the following relativity related textbook now. I was wondering if there was a way to prove the invariance of the space-time interval just from postulating a constant speed of light and an isotropic space-time. Most arguments go "from the Lorentz transformations it can be seen that the interval is invariant." Can we show the invariance without first appealing to the Lorentz transformations? Thanks.

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Last Post By: albertwilson ON: Fri Jul 30, 2010 5:31 am
Topic By: albertwilson ON: Fri Jul 30, 2010 5:31 am
I am stuck at a really straight-forward problem about SR:

In a beam of antineutrinos, it is proposed to search for tau anti-neutrino via their interactions on protons in a stationary target to produce anti-tau particles.

(a) Calculate the minimum energy of the tau anti-neutrino which would permit anti-tau production; (I have done this far, by using the fact that 4-momentum squared is frame invariant)

(b) What is the energy of the produced anti-tau when tau anti-neutrino has this threshold energy?

I just wonder what the strategy is, or what would be the most clever and neat way to do it.

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Last Post By: albertwilson ON: Fri Jul 30, 2010 5:28 am
Topic By: albertwilson ON: Fri Jul 30, 2010 5:28 am
There are “Texas Pete”: is captured and given a community service order to round up all the sheep using a giant vacuum cleaner. If there are 3000 million sheep and these have an average separation between them of 10m (in stationary reference frame S), then at what sub-light speed (V wrt S) must “Texas Pete” travel in order to capture all the sheep in t’=60 seconds of his time in reference frame S’? Note: you may completely ignore the relativistic mass increase resulting from cumulative inelastic collisions (captures of) with sheep.

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Last Post By: albertwilson ON: Fri Jul 30, 2010 5:25 am
Topic By: albertwilson ON: Fri Jul 30, 2010 5:25 am
I'm new to this site, so any help on how to meet other bloggers and share my stuff would be great! Also, is that "expose yourself" thing legit? ...

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Last Post By: albertwilson ON: Fri Jul 30, 2010 5:22 am
Topic By: albertwilson ON: Fri Jul 30, 2010 5:22 am
There has i found the problem of the ocsillating molecule interesting as well as the electron revolving around the nucleus, in both cases there is energy loss due to radiation and eventually the molecule will stop ocsilating and the electron will be together with the nucleos. the times when this happen are really low we got 10^-5 s for the molecule and 10^-38 seconds for the electron.

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Last Post By: albertwilson ON: Fri Jul 30, 2010 5:20 am
Topic By: albertwilson ON: Fri Jul 30, 2010 5:20 am
This is despite my upmost attempts to find a simple web deffinition, i am so far unable to comprehend what quantum spin is exactly...whilst i have a vauge idea it would be so much better if the whole conspet could be cleared up by someone who knows what they are talking about.

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Last Post By: albertwilson ON: Fri Jul 30, 2010 5:19 am
Topic By: albertwilson ON: Fri Jul 30, 2010 5:19 am
The photoelectric effect refers to the emission, or ejection, of electrons from the surface of, generally, a metal in response to incident light.

Energy contained within the incident light is absorbed by electrons within the metal, giving the electrons sufficient energy to be 'knocked' out of, that is, emitted from, the surface of the metal.

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Last Post By: albertwilson ON: Fri Jul 30, 2010 5:17 am
Topic By: albertwilson ON: Fri Jul 30, 2010 5:17 am
Albert Einstein was born at Ulm, in Württemberg, Germany, on March 14, 1879. Six weeks later the family moved to Munich, where he later on began his schooling at the Luitpold Gymnasium. Later, they moved to Italy and Albert continued his education at Aarau, Switzerland and in 1896 he entered the Swiss Federal Polytechnic School in Zurich to be trained as a teacher in physics and mathematics.

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