# x(x-y)

Senior Members

69

## Community Reputation

10 Neutral

• Rank
Meson
• Birthday 02/10/1994

## Profile Information

• Interests
Physics - especially quantum mechanics, particle physics, mathematical analysis of waves.

Mathematics - especially calculus, complex analysis, group theory and vectors.
• College Major/Degree
Currently studying Physics at University of Birmingham (UK)
• Favorite Area of Science
Physics
1. ## Post Your Current System Specs!

I would've just edited the OP, but I can't now - anyway, an update to my system: CASE - Corsair 900D SuperTower Case (to be released next month) RAM - TeamGroup Xtreem LV 16GB DDR3 @ 2133MHz
2. ## Curious Error Analysis

I see - that makes sense.

4. ## Curious Error Analysis

Ah, yes, what an amateur mistake. That seems odd though, if I change everything to radians then the errors make sense - however surely if you were using degrees for theta then you'd stick with that convention all the way through your calculation? Well, obviously not I guess - I really should stop using degrees altogether, I work in radians most the time anyway. Thanks.
5. ## Curious Error Analysis

I have a set of results from an experiment I did recently in the lab where one array of results is for the variable $\theta$. In order to obtain a graph from which I can analyse the results and obtain a value for the electron mass I must take the cosine of this variable, to give me the following data: $\cos \theta = [0.94, 0.77, 0.50, 0.17, -0.17, -0.50]$ Now, the errors on theta are plus/minus 0.5° and so using the standard error formula and assigning a variable y to the cosine of theta such that $y = \cos \theta$, I obtain the error on y (which
6. ## Compton Scattering Energy Equation?

Yep that works - but you can skip a few of those last steps actually and get to the answer easily from $\frac{1}{E_2} - \frac{1}{E_1} = \frac{1}{m_e c^2} \left(1-\cos \theta \right)$ Anyway, thanks for the help.
7. ## Compton Scattering Energy Equation?

I see, thanks. So after searching for specific terms I can find the derivations just by searching for "compton scattering" generically. Great.
8. ## Compton Scattering Energy Equation?

Could anybody point me in the right direction as to how one would derive the equation below? $E_{\gamma}'=\frac{E_{\gamma}}{1+\frac{E_{\gamma}}{m_0 c^2} \left(1- \cos \theta \right)}$ I read it in my lab manual along with the Compton Wavelength equation (which I know how to derive) and I'm wondering where it comes from. Thanks.
9. ## Chaos in Electric Circuits Ideas

That'll work - I'll try to formulate a plan to study something to do with a simple Chua's circuit, maybe measuring the voltage across the capacitors on the oscilloscope and objserving the lissajous figures to identify bifurcations as the source voltage is increased. Something like that anyway.
10. ## Post Your Current System Specs!

I'm just about to buy these components to build my own computer: CASE - Corsair 800D Full Tower Case CPU - i7-3930K @ 3.20GHz (obviously can be OC'd) GPU - GeForce GTX Titan 6GB GDDR5 RAM - Corsair Dominator Platinum 16GB 1866MHz HDD1 - Samsung PRO 840 SSD 256GB HDD2 - Seagate Barracuda 2TB 7200RPM COOLING - XSPC RayStorm D5 EX360 WaterCooling Kit MONITOR - Dell UltraSharp 27" U2713H 2660x1440 MOTHERBOARD - Asus Rampage IV Extreme Intel X79 (S2011) PSU - Corsair Professional Series 860 W '80 Plus Platinum' So, go ahead and post your current (and/or planned system specs)!
11. ## Chaos in Electric Circuits Ideas

I have a diode, an inductor (basically a coil) mounted on a breadboard which is connected to an oscillator from which I can alter the frequency, the dc offset and the source voltage, and it is also connected up to a an Oscilloscope. So I was wondering if anybody could come up with an interesting experiment to perform related to chaos in this electrical circuit and/or encoding/decoding signals. I have already done a simple experiment where I increased the source voltage and measured the points at which bifurcations in the voltage oscillations on the CRO display occurred (period-doubling bif
12. ## Meteorite fall in Chelyabinsk!

I do find that fascinating though that this bit of "rock" transferred considerably more energy to the atmosphere than the nuclear weapons we designed to explode with huge force. Just imagine if a Tunguska like event just so happened to occur directly over a major city, the consequences would be devastating - it would be tantamount to setting off a hydrogen bomb mid-air over said city. Extraordinary, for all our advances in technology and the supposed anti-missile systems which cover countries like the US - if one of these bits of "rock" penetrated our atmosphere and headed straight for a
13. ## Meteorite fall in Chelyabinsk!

Makes sense. @Michel: The flash of light is essentially caused due to a very large amount of energy being transferred to the surroundings in a very short amount of time - due to increased relative surface area. Think about burning pieces of wood - if you set fire to a very large piece of wood (which has a high volume in relation to its surface area) then it will take a long time for it to burn and consequently the flame intensity (brightness) will be relatively low over a small amount of time. However, if you burn very small pieces of wood (which have high surface area to volume ratios) th

Yes, quite.
15. ## Meteorite fall in Chelyabinsk!

It is called a bolide, but as far as I'm aware this event was not a bolide - the meteorite did not explode during descent, rather it fragmented and vapourised (hence the vapour trails) with only a few fragments reaching the ground. The "explosion" itself was the shockwave caused by the meteorite breaking the sound barrier as it entered the Earth's atmosphere; note that the shockwave was also due to the loss in kinetic energy of the rock as it entered our atmosphere, it was moving at some 8km/s before entering and slowed right down upon entry, that energy loss has to go somewhere. NB - An e
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