Recent content by SporadicSmile

Curvature being graviton density (one assumes that means number of gravitons per unit spacetime i guess?) then would this mean that something producing a gravitational field would have to emit gravitons at a constant rate? so as to keep the curvature at a point the same, and thus the force the...

The simple answer is that gravity is a force caused by the mass of an object. Any two objects that have mass will attract each other through gravity. Thus any objects that have mass will attract each other. Gravity keeps the moon orbiting the earth, the Earth orbiting the sun, the sun orbiting...

By how much are you trying to deflect them? Because cosmic rays can travel a LONG way in your average magnetic field without being significantly reflected. So if you are trying to change their direction a large amount in a short distance, then yes you should be expecting a very large magnetic...

Gravity is our friend =] if the average speed of the molecules does not exceed the escape velocity then the molecules can't escape from the earth. The reason Earth has a thicker atmosphere than Mars is (partly) to do with the fact Mars is smaller and thus was less able to hold onto it.

Something I personally have never understood about gravitons. Will they themselves have energy and so cause curvature? I'm not qute sure about how massless particles affect spacetime, my understanding of GR is crude at best (though improving slowly =]).

Well, if dark matter particles (whatever they may be) are fermions, then there would be something akin to electron degeneracy pressure inside a dark matter star (should such a beast exist) that would prevent said star collapsing until there was enough mass to produce a gravitational force to...

What force is providing the repulsion? Decide on your force, and then calculate the energy caused by this force. Then simple to calculate the shift in enegry.

You need the wavefunction for particles in an infinite square well (which is the same as this box). Then feed in your particles to the energy levels, as you would in an atom, then calculate the energy of the last electron in the orbital. Do the same for spin 1 and spin 3/2 particles. Take care...

Well, when i vote for the most embarasing moment of the year i think i know what i will pick.. Goddamit! Well, at least i can do algebra, i just can't remeber formulae! that's almost something i think Cheers =>

Okay i will set out my calculations, might be useful might be i spot my own mistake, or what i need to do. Solving the quadratic formula: E_\pm = \frac{-b^2 \pm \sqrt{b^2 - 4ac}} {2a} where, in the case of the equation i have: a = (1 - S^2) b = 2(\beta S - \alpha)...

From Atkins 'Molecular Quantum Mechanics' page 254: Perhaps my post also wasn't very clear, the third equation is an expansion of the determinant, just looking over it realized that might not be 100% clear at first glance. Wouldn't E = 0 only be a solution to the quadratic equation if...

Not a problem par se, as much as me failing somewhere in algebra, and i can't find my mistakes. Trying to work through the secular determinant E_\pm = det\left( \begin{array}{cc} \alpha - E & \beta - ES\\ \beta - ES & \alpha - E \end{array}...

You are on the right lines. Now you need to evaluate what the L+ operator acting on the state |l,m> is, and the same for L-. then you will have something which has the form < | > + < | >. From this point, the answer is straightforward. Thats about as precise as i can be without doing it for...

Well, I can't give you an overall comparison, but in the experiment I am part of we use a tof mass spec. The basic setup is that we are ionising molecules using photons, and then measuring the way in which the electrons are emitted, in a process called velocity map imaging. The details here...

The electron configuration tells you the quantum numbers, eg in the 1s^2, the 1 refers to the principle quantum number n, the s to the angular momentum number l [which can take values 0 -> n-1] and the 2 is the number of spin configurations you can have for this value of l, in this case it is...